Desserts
This banana cake made with oil delivers ultra-moist layers that stay tender for days—no dry crumbs in sight. 💛 The secret lies in oil's ability to create a velvety crumb while keeping the cake rich and flavorful, even without butter. I developed this recipe after years of baking banana cakes that turned out either too dense or too dry, and this version finally solves that problem.
The recipe uses simple pantry staples—ripe bananas, vegetable oil, and basic spices—to create a cake that's foolproof for beginners yet impressive enough for gatherings. The oil-based batter mixes together in minutes, and the cake bakes up with a golden top and a tender, slightly spiced interior that's perfect for slicing or layering with frosting.
What makes this recipe stand out is the harmony between the cake and frosting. The buttery vanilla frosting complements the cake's natural sweetness without overpowering it, creating a dessert that's rich, moist, and restaurant-quality at home. The texture is what truly sets it apart—no one will guess it's made with oil instead of butter.
Whether you're baking for a birthday, potluck, or just a sweet treat, this recipe delivers consistent results. The cake keeps well for up to 3 days, making it perfect for meal prep or sharing. Let's get started on creating this crowd-pleaser!
Ingredients for banana cake made with oil
Simple pantry staples create this ultra-moist banana cake with restaurant-quality harmony.
| Ingredient | Amount | Notes |
|---|---|---|
| Ripe Bananas 🍌 | 1 ½ cups | Mashed, about 3 medium bananas |
| Vegetable Oil 🫒 | 1 cup | Light or neutral flavor preferred |
| Granulated Sugar 🍚 | 1 ½ cups | White or light brown sugar |
| All-Purpose Flour 🌾 | 2 cups | Sifted for even texture |
| Baking Soda 🧂 | 1 tsp | Ensures proper rise |
| Ground Cinnamon 🌿 | 1 ½ tsp | Warm, aromatic flavor |
| Salt 🧂 | ½ tsp | Kosher or sea salt |
| Vanilla Extract 🌸 | 1 tsp | Pure extract preferred |
| Unsalted Butter 🧈 | ½ cup | Cold, cubed for frosting |
| Powdered Sugar 🍚 | 2 cups | Sifted for smooth frosting |
| Heavy Cream 🥛 | ½ cup | Cold for best whipping |
The bananas are the star—ripe, with brown spots—their natural sweetness balances the sugar perfectly. Trader Joe's or your local grocery store usually has the sweetest ones in the produce section. If they're not ripe enough, let them sit on the counter for a day or two. The vegetable oil is non-negotiable here; it keeps the cake tender without adding moisture like butter would. Crisco or any neutral oil works, but avoid flavored ones like olive oil. For the flour, King Arthur or Gold Medal brands are reliable—sift it before mixing to avoid lumps in the batter.
No ripe bananas? Cook them down with sugar until soft, then mash. Running short on powdered sugar? Blend granulated sugar in a food processor for a quick substitute. The frosting can be made ahead and stored in the fridge—just re-whip before serving. Want extra richness? Add a pinch of salt to the frosting to enhance the vanilla flavor. The butter should be cold when you start whipping it, or you'll end up with buttercream instead of frosting. If your heavy cream isn't cold, chill it for 15 minutes before using.
This cake keeps beautifully for 3-4 days in an airtight container at room temperature or 1 week in the fridge. The frosting can be made a day ahead—just store it in the fridge and re-whip before spreading. For a restaurant-quality touch, dust the top with a little powdered sugar before serving. The cake freezes well too—wrap tightly in plastic wrap and foil, and it'll stay moist for up to 3 months. Portion it into slices for easy serving at gatherings.
Why You'll Love This Recipe
- Here’s what sold me: I already had everything. No eggs, no butter, no fancy add-ins—just bananas, oil, sugar, flour, and a pinch of baking soda. It’s the kind of recipe that turns a “what’s for dessert?” into “oh, we’ve got this” in five minutes, and the leftovers? They last a week if you’re disciplined (I’m not).
- No Mash Required: I’ll admit, I used to hate mashing bananas—sticky fingers, uneven lumps, you name it. But this recipe? Just slice and fold. The oil keeps everything tender without needing to overwork the batter, and those ripe bananas blend right in while you’re mixing the dry ingredients.
- Sweet Without Overpowering: Honestly, the sugar here plays second fiddle to the bananas. The oil gives it a moist, almost custardy texture, but it’s not heavy or greasy—just rich enough that you won’t need frosting (though, between us, a dusting of powdered sugar makes it even better).
- Breakfast or Snack, Any Day: I’ve served this cold from the fridge on lazy mornings, reheated slices in the toaster for a quick pick-me-up, and even packed it for lunch when my kids’ after-school energy crashes hit. The baking soda keeps it light, so it doesn’t turn gummy—just consistently good.
Step-by-step instructions for banana cake with oil
This method delivers perfectly moist layers and a velvety frosting every time.
🍳 Step 1: Mix Wet Ingredients for Maximum Moisture
In a large mixing bowl, combine the 1.5 cups mashed ripe bananas with the 1 cup vegetable oil and 1.5 cups granulated sugar. Stir until fully blended—you'll see the mixture lighten in color as the sugar dissolves. The bananas should be completely smooth with no lumps, so press them through a fine-mesh sieve if needed.
Add the 1 tsp vanilla extract and mix again. This step creates the cake's signature moistness—the oil and mashed bananas work together to keep every bite tender. I always use ripe bananas (they should have brown speckles) because they're sweeter and mash more smoothly. The mixture should be thick but pourable, like a thin batter.
👨🍳 Step 2: Combine Dry Ingredients for Perfect Texture
In a separate bowl, whisk together the 2 cups all-purpose flour, 1 tsp baking soda, 1.5 tsp ground cinnamon, and 0.5 tsp salt. Sift the flour first to aerate it—this prevents dense layers. The baking soda ensures a proper rise while the cinnamon adds that classic banana cake warmth.
Gradually add the dry ingredients to the wet mixture, mixing just until combined. I use a spatula to gently fold everything together—overmixing develops gluten and makes the cake tough. Stop mixing as soon as you see no more flour streaks. The batter should be thick but smooth, with a consistency similar to pancake batter.
🔥 Step 3: Bake in Two Layers for Even Cooking
Preheat your oven to 350°F. Divide the batter evenly between two 8-inch round cake pans lined with parchment paper. I use round pans because they bake more evenly than square pans, giving consistent layers. Tap the pans gently on the counter to remove any air bubbles.
Bake for 25-30 minutes until a toothpick inserted in the center comes out clean with just a few moist crumbs. The edges should be golden brown but the tops should still look slightly underdone—they'll finish cooking as they cool. Rotate the pans halfway through baking for even browning. Don't open the oven door during baking or the cakes may sink.
⏰ Step 4: Prepare the Buttery Frosting
While the cakes cool, make the frosting by beating the 0.5 cup cold unsalted butter until smooth and creamy. Add the 2 cups powdered sugar and mix on low speed until combined. Gradually add the 0.5 cup cold heavy cream while continuing to mix until light and fluffy.
This frosting needs to be perfectly smooth—any lumps will show up in the final product. I like to beat it for about 2-3 minutes until it reaches a spreadable consistency. The cold butter creates a stable base that won't melt too quickly, while the heavy cream adds that signature lightness. Taste and adjust sweetness if needed, though the recipe is usually spot-on.
🥘 Step 5: Assemble and Chill for Perfect Texture
Level the cooled cakes if needed, then place one layer on a serving plate. Spread half of the frosting evenly over the top, then place the second layer on top. Cover the entire cake with the remaining frosting, spreading it smoothly to the edges. I use an offset spatula for clean, even coverage.
Chill the cake in the refrigerator for at least 1 hour before serving. This resting period allows the frosting to set properly and the flavors to meld together. The cake will keep well in the fridge for up to 3 days, though I find it's best enjoyed fresh. The combination of moist banana layers and rich buttercream creates that perfect harmony of texture and flavor.
Pro Tips For Making Banana Cake Made With Oil
- MASH THE BANANAS FINE: Don’t just chop them—squish those bananas through a fork or press them against a strainer to remove excess liquid. I learned this the hard way when my cake turned out dense and gummy from too much banana water.
- WEIGH YOUR FLOUR: Scooping flour from the bag packs it down, and that’s how you end up with a dry, crumbly cake. Use a kitchen scale or the spoon-and-level method—fill a cup, level it off, and stop. Your cake will thank you with a proper crumb.
- TEST FOR DONENESS WITH A TOOTHPICK: The cake might look set but still be undercooked inside. Stick a toothpick in the center—if it comes out with moist crumbs (not wet batter), it’s ready. I’ve pulled cakes out too soon, and they collapsed like sad soufflés.
- SWAP OIL FOR BUTTER (IF YOU DARE): If you’re feeling fancy, replace half the vegetable oil with melted butter—it adds richness and a subtle flavor. Just don’t overdo it, or your cake will turn out greasy. (Yes, I’ve tried.)
Pro cooking tips for banana cake made with oil
Oil Over Butter
The key to this ultra-moist banana cake lies in using vegetable oil instead of butter. Oil creates a tender, velvety crumb because it doesn't introduce moisture like melted butter would. For best results, use neutral-flavored oil like Crisco or Mazola—avoid olive or coconut oil, which can add unwanted flavors. The oil coats the flour proteins differently, resulting in a cake that stays moist for days. 💛
Banana Ripeness Matters
Choose bananas with dark brown speckles—these are perfectly ripe and sweeter than green bananas. If your bananas aren't ripe enough, place them in a brown paper bag with an apple for 24 hours to speed up ripening. Overripe bananas with black spots? No problem—just remove the black parts before mashing. The natural sweetness of ripe bananas balances the sugar perfectly, reducing the need for extra sweetness in the cake.
Mix Just Until Combined
When combining wet and dry ingredients, stop mixing as soon as the batter comes together. Overmixing develops gluten, which makes the cake dense and tough. I use a spatula to gently fold the dry ingredients into the wet—just until no flour streaks remain. The batter should be thick but pourable, similar to pancake batter. This technique ensures a light, airy texture without overworking the flour.
Bake Time Precision
Bake the cake at 350°F for 25-30 minutes—the exact time depends on your oven. A toothpick inserted in the center should come out with a few moist crumbs, not wet batter. The cake is done when the edges pull away slightly from the pan. Avoid opening the oven door during baking, as this can cause the cakes to sink. Rotate the pans halfway through for even browning.
Frosting Temperature Control
For a perfectly smooth frosting, beat the cold butter until creamy before adding powdered sugar. Cold butter creates a stable base that won’t melt too quickly. Gradually add the cold heavy cream while mixing on medium speed—this prevents the frosting from becoming too runny. Beat for 2-3 minutes until light and fluffy. If the frosting is too thick, add 1 tsp milk at a time until it reaches a spreadable consistency.
Chill Before Serving
Chilling the cake for at least 1 hour before serving is non-negotiable. This step allows the frosting to set properly and prevents it from sliding off the layers. The cake will hold its shape better and taste even more delicious after resting. If you're in a hurry, chill for 30 minutes—just be gentle when slicing. The longer it chills, the cleaner the slices will be, making it perfect for gatherings. ✨
Nutrition facts
Frequently asked questions
Why does this recipe use oil instead of butter?
Oil creates a moist, velvety crumb without adding extra moisture like melted butter would. The neutral vegetable oil coats flour proteins differently, resulting in a cake that stays tender for days. This method also makes the batter easier to mix and prevents dryness, especially in humid climates.
Can I substitute coconut oil for vegetable oil?
While you can use coconut oil, it adds a distinct flavor that may overpower the delicate banana taste. For a neutral flavor, stick with vegetable or canola oil. If you must use coconut oil, use the refined version (not virgin) and reduce the amount by 1 tablespoon to prevent richness.
How do I know when my bananas are ripe enough?
Look for bananas with dark brown speckles on the peel—they're perfectly ripe and sweeter than green bananas. If they're too green, place them in a paper bag with an apple for 24 hours to speed up ripening. Overripe bananas? Just remove the black spots before mashing—they'll still work!
Can I make this cake in a single layer instead of two?
Yes! Use a 9-inch round pan and increase baking time by 5-10 minutes. The cake will be denser but still moist. For best results, reduce the frosting by 1/3** to avoid a soggy top. A single layer works great for individual servings or smaller gatherings.
Why does my cake turn out dense?
Overmixing the batter is the most common cause. Stop mixing as soon as the dry ingredients disappear—30 seconds max after combining. Also, ensure your bananas are ripe (not green) and your flour is sifted. If using a different pan size, adjust baking time accordingly to prevent overcooking.