Banana Oat Cake (Made with Whole Oats, No Flour)

This banana oat cake is the answer when you need a quick, wholesome treat with just a blender and pantry staples. No flour, no mixer, no fuss — just ripe bananas and whole oats doing the heavy lifting.

The cake bakes up tender and fragrant, with a golden crust and a soft crumb that stays moist for days. It’s just sweet enough for breakfast or an afternoon snack, and it’s packed with whole-grain goodness.

Why This Banana Oat Cake Works

Blending the oats directly means you never have to sift or measure flour. The same blender bowl gets all the wet ingredients, so cleanup is a breeze. The bananas bring enough natural sugar that you only need a small pour of maple syrup — and they keep the crumb moist without any heavy fats.

The texture is soft but sturdy, with a hint of chew from the oat flour that makes each slice satisfying. A dash of cinnamon rounds out the flavor, and a handful of chocolate chips or walnuts turns it into a proper dessert.

Ingredients

• 2 cups (180 g) rolled oats: old-fashioned oats give the best texture; quick oats can make the batter gummy.
• 3 very ripe medium bananas, plus 1 for topping (optional): the spottier, the sweeter.
• 2 large eggs: room temperature for even blending.
• ¼ cup (60 ml) melted coconut oil or butter: butter adds richness; coconut oil keeps it dairy-free.
• 3 tbsp maple syrup: swap with honey or agave to taste.
• 1 tsp vanilla extract
• 1 tsp baking powder
• ½ tsp baking soda
• ¼ tsp salt
• 1 tsp ground cinnamon
• Optional: ½ cup chocolate chips or chopped walnuts.

Variations / Substitutions

• Gluten-free: Use certified gluten-free rolled oats. The cake is flourless, so no other swaps are needed.
• Dairy-free / Vegan: Replace eggs with 2 flax eggs (2 tbsp ground flaxseed + 5 tbsp water) and use melted coconut oil. The texture will be slightly more dense.
• Nut-free: Use a neutral oil like avocado oil instead of coconut oil, and skip any nut add-ins.
• Sugar-free: Omit the maple syrup if your bananas are very ripe; the cake will be less sweet but still lovely.
• Spice swap: Add ¼ tsp nutmeg or a pinch of cardamom for a warmer profile.

If you love this, try my Zucchini Oat Bread for another whole-grain quick bread.

How to Make Banana Oat Cake

Step 1: Blend the Oats into Flour

Add the 2 cups rolled oats to a blender. Pulse until they turn into a fine powder, about 30 seconds. Stop and scrape down the sides if needed. You want it as fine as all-purpose flour, with no visible oat flakes.

The oat flour should feel soft and powdery to the touch, with a faintly sweet, nutty scent. If it’s still chunky, give it a few more pulses. A coarse grind will make the cake dense and a bit gritty.

Step 2: Add the Wet Ingredients and Blend

Crack the 2 eggs into the blender right on top of the oat flour. Add the 3 ripe bananas (break them into chunks), the ¼ cup melted coconut oil, 3 tbsp maple syrup, and 1 tsp vanilla extract. Blend on high until the mixture is completely smooth and pourable, about 45 seconds. Scrape down the sides once halfway through.

The batter will be thick but glossy, with a pale banana-yellow color. It should smell sweet and buttery. If it seems too thick to pour, add a tablespoon of milk (dairy or non-dairy) and blend again.

Step 3: Mix in the Leaveners and Spices

Add the 1 tsp baking powder, ½ tsp baking soda, ¼ tsp salt, and 1 tsp cinnamon directly into the blender. Pulse 4 to 5 times just until they disappear into the batter. Do not over-blend. If you’re adding chocolate chips or walnuts, stir them in by hand now.

The batter will loosen slightly as the baking powder and soda react. You’ll see tiny bubbles forming on the surface. A quick taste should reveal a pleasant warmth from the spice and a balanced hit of salt.

Step 4: Bake the Cake

Pour the batter into an 8×4-inch loaf pan lined with parchment paper. Slice the extra banana lengthwise and lay the halves on top for a pretty finish, if using. Bake at 350°F (180°C) for 45 to 50 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs. Start checking at 40 minutes.

The kitchen will smell incredible around the 30-minute mark. The top will puff and turn deep golden brown, and the edges will pull slightly away from the pan. A crack down the middle is normal and looks lovely. If the top is browning too fast, tent it loosely with foil after 35 minutes.

Step 5: Cool and Slice

Let the cake cool in the pan for 10 minutes, then lift it out by the parchment and transfer to a wire rack to cool completely before slicing. Run a knife around the edges if needed. Slice into 8 thick pieces and serve warm or at room temperature.

Warm slices are especially tender, almost pudding-like in the center. When fully cooled, the crumb firms up and slices cleanly. A schmear of cream cheese or a drizzle of honey takes it over the top.

A Few Tips Before You Start

• Use bananas that are heavily speckled or even black. They’re sweeter and break down more thoroughly in the blender, giving the cake a softer crumb.
• For a bakery-style shiny top, sprinkle a teaspoon of coarse sugar (turbinado or demerara) over the sliced banana before baking. It melts into a crackly crust.
• This cake freezes beautifully. Wrap the completely cooled loaf tightly in plastic wrap and foil, then freeze for up to 3 months. Thaw at room temperature overnight.

Bake times will vary by pan size:

Storing and Keeping the Cake Fresh

• Refrigerate: Store the cake in an airtight container at room temperature for up to 2 days. For longer storage, keep it in the fridge for up to 5 days. Let a cold slice come to room temperature before eating for the best texture.
• Reheating: Warm individual slices in a toaster oven at 300°F for 5 minutes, or microwave for 15 seconds. This refreshes the moistness.
• Serve Cold: The cake is also delicious straight from the fridge, especially with a smear of peanut butter.

What to Serve With Banana Oat Cake

A cup of strong coffee contrasts the cake’s sweetness and brings out the cinnamon. For a more substantial breakfast, plate a slice with a dollop of thick Greek yogurt and a handful of fresh berries. If you’re treating it as dessert, a drizzle of melted dark chocolate and a scoop of vanilla ice cream turn it into a warm, messy sundae.

Frequently Asked Questions

Can I make this in a food processor instead of a blender?

Yes, but the oat flour will be slightly coarser. Pulse until very fine, then proceed as written. The cake will have a bit more texture.

Can I use quick oats?

It’s not recommended. Quick oats absorb more liquid and turn mushy, making the cake dense and gummy. Stick with old-fashioned rolled oats.

Is this cake gluten-free?

It is if you use certified gluten-free rolled oats, as there is no wheat flour in the recipe. Check the label to be sure.

Why did my cake sink in the middle?

This often happens if the bananas were overripe and extra liquid, or if the cake was underbaked. A slight dip is normal. Test with a toothpick and bake until just done.

Banana Oat Cake Recipe

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 45 minutes mins

Total Time 55 minutes mins

Servings: 8 servings

Calories: 176

Ingredients Method Notes

Ingredients

  

• 2 cups (180 g) rolled oats
• 3 very ripe medium bananas, plus 1 for topping (optional)
• 2 large eggs
• ¼ cup (60 ml) melted coconut oil or butter
• 3 tbsp maple syrup
• 1 tsp vanilla extract
• 1 tsp baking powder
• ½ tsp baking soda
• ¼ tsp salt
• 1 tsp ground cinnamon
• Optional: ½ cup chocolate chips or walnuts

Method

 

1. Blend the oats into a fine powder in a blender, about 30 seconds.
2. Add the eggs, bananas, melted coconut oil, maple syrup, and vanilla. Blend until smooth, about 45 seconds.
3. Add the baking powder, baking soda, salt, and cinnamon. Pulse just until mixed. Fold in any add-ins by hand.
4. Pour the batter into a parchment-lined 8×4-inch loaf pan. Top with sliced banana if desired. Bake at 350°F (180°C) for 45 to 50 minutes, until a toothpick comes out clean.
5. Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely. Slice and serve.

Notes

If using a square pan, start checking at 30 minutes. The cake can be made ahead and frozen, tightly wrapped, for up to 3 months. Let it cool fully before wrapping.