Name: 3-Ingredient Blender Banana Oats Cake Recipe
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Ingredients: 2 large ripe bananas; 2 cups rolled oats; 2 large eggs

This banana oats cake is the quickest, healthiest cake you’ll make all week. Three ingredients and a blender is all it takes.

It’s naturally sweet from the bananas, moist, and works for breakfast or an afternoon snack. No flour, no sugar, no fuss.

Why This Oats Cake Works

The oats and banana create a soft, tender crumb without a speck of flour. You don’t need any butter or oil. The fruit does all the heavy lifting.

It’s genuinely hard to mess up. Toss everything into a blender, pour, bake, and you get a cake that slices cleanly and stays moist for days. That reliability is why I keep coming back to it.

Ingredients

2 large ripe bananas: the spottier, the sweeter
2 cups rolled oats: certified gluten-free if you need that
2 large eggs: room temperature helps the batter blend evenly

Variations / Substitutions

Swap the sweetener: if your bananas are not super ripe, drizzle in 2 tbsp maple syrup or honey before blending.
Add crunch: fold in a handful of chopped walnuts or pecans after blending for texture.
Flavor it: 1 tsp vanilla extract or a pinch of cinnamon lifts the whole cake.
Make it dairy-free: the recipe is already dairy-free as written.
Try a different fruit: swap one banana for the same amount of puréed pumpkin or unsweetened applesauce and add 1 tsp pumpkin pie spice.

If you want a heartier loaf, give my oat flour banana bread a look.

How to Make 3-Ingredient Blender Banana Oats Cake

Step 1: Blend the Batter

Preheat the oven to 350°F (180°C) and line a standard 8×4-inch loaf pan with parchment, letting the ends hang over for easy lifting. Add the 2 bananas, 2 cups rolled oats, and 2 eggs to a blender. Blend until completely smooth and the batter looks like thick pancake batter, scraping down the sides halfway through.

The mixture will be thick but pourable. A few tiny oat specks are fine, but you don’t want any large dry clumps.

Step 2: Bake the Cake

Pour the batter into the prepared pan and smooth the top with a spatula. Slide it into the oven and bake for 25 to 30 minutes. Start checking at the 25 minute mark. The cake is done when the top is golden, the edges pull slightly away from the pan, and a toothpick stuck in the center comes out clean.

You’ll notice a few cracks across the top. That’s normal and exactly what you want. The top should feel springy when you press it gently.

Step 3: Cool and Slice the Cake

Pull the loaf out of the oven and let it sit in the pan for about 10 minutes so it sets up. Then lift it out by the parchment, transfer to a rack, and let it cool completely before slicing. Use a serrated knife for the cleanest cuts.

Slice the loaf into thick slabs and serve plain, or with whatever you like. The crumb is pale, moist, and smells like toasted oats and warm bananas.

A Few Notes Before You Start

If you don’t own a blender, pulse the oats into a flour in a food processor, then whisk everything together by hand. The batter will be a bit coarser but still works.
For a fluffier rise, add 1 tsp baking powder to the blender. It won’t change the ingredient count much and the cake stays flourless.
Over-blending can make the cake turn out a bit rubbery. Blitz just until the batter is smooth, then stop.
Let the cake cool all the way before slicing. Warm cake tends to tear and crumble, so patience pays off.

Bake times by pan:

Pan	Bake Time
8×4-inch loaf pan	25–30 mins
9×5-inch loaf pan	22–25 mins
8-inch round pan	18–22 mins

Storing Leftover Oats Cake

Refrigerate: keep slices in an airtight container for up to 4 days. The cake stays moist directly from the fridge.
Reheating: a quick 20-second zap in the microwave or a few minutes in a warm toaster oven brings back that fresh-baked softness.
Serve cold: this cake is just as good straight from the fridge, especially with a smear of almond butter.

What to Serve with Oats Cake

A spoonful of thick Greek yogurt and a handful of fresh berries turns a slice into a light breakfast. For a sweeter snack, drizzle a little honey or maple syrup over the top. If you want something more substantial, smear on a layer of peanut or cashew butter. The nuttiness plays well against the mild banana.

Frequently Asked Questions

Can I use steel-cut oats?

No, they are too coarse and won’t break down in the blender. Stick with rolled oats or quick oats.

Can I make this without eggs?

Yes, use two flax eggs (2 tbsp ground flaxseed mixed with 5 tbsp water, set for 5 minutes). The cake will be a touch denser but still holds together.

Is there a way to add protein powder?

Absolutely. Add one scoop of vanilla or unflavored protein powder to the blender. The batter may thicken up, so you might need a splash of milk to loosen it.

Can I turn this into muffins?

Yes. Divide the batter into a lined 12-cup muffin tin and bake at the same temperature for 18 to 20 minutes. Check with a toothpick just like the loaf.