3 Ingredient Banana Brownies Recipe bakes up fudgy, chocolatey, and naturally sweet with cozy banana flavor. It suits busy bakers, gluten-free friends, and anyone craving a weeknight treat, and it takes about 30 minutes start to finish. I tested this on a sleepy Sunday, and my kids asked for more before the pan cooled.
Why Choose This 3 Ingredient Banana Brownies Recipe
This 3 Ingredient Banana Brownies Recipe keeps things simple and still delivers rich, brownie-level chocolate flavor. You skip flour, oil, and refined sugar, which makes this a faster stir-and-bake dessert that still tastes indulgent.
My family inhaled these fudgy squares and the pan washed up in minutes, ★★★★★
Ingredients You Need
- 3 large ripe bananas, mashed well, about 1.5 cups or 340 g (the spottier, the sweeter)
- 1 cup creamy peanut butter, about 260 g (natural style with just peanuts and salt works best; swap almond butter or sunflower seed butter if needed)
- 1/2 cup unsweetened cocoa powder, 45 to 55 g (Dutch-process gives deeper color; Hershey’s Special Dark or Ghirardelli work nicely)
- Optional boosters: 1/4 teaspoon fine salt if your nut butter is unsalted, 1 teaspoon vanilla, 1/2 cup chocolate chips, or 2 tablespoons maple syrup if you want extra sweetness
Pantry shortcuts and notes:
- Use shelf-stable natural peanut butter to skip stirring oil separation right before mixing.
- If your bananas run small, add an extra half banana to keep the batter smooth and fudgy.
- Sift lumpy cocoa through a fine strainer so the batter mixes fast.
Equipment:
- 8-inch square metal pan, parchment paper, and nonstick spray
- Medium mixing bowl, sturdy fork or potato masher, spatula
- Measuring cups or a scale, and a knife for slicing
How to Make 3 Ingredient Banana Brownies Recipe
Step 1: Prep and preheat
- Heat the oven to 350°F or 175°C. Line an 8-inch square pan with parchment and lightly grease it so the brownies lift out cleanly. Set the pan aside.
Step 2: Mash the bananas
- Peel the bananas and add them to a mixing bowl. Mash until mostly smooth with small specks. Aim for about 1.5 cups mashed banana to keep the texture fudgy.
Step 3: Mix the batter
- Add peanut butter and cocoa powder to the bowl. Stir until the batter looks thick, shiny, and uniform with no dry cocoa pockets. Fold in optional vanilla or chocolate chips if you use them.
Step 4: Bake and cool
- Spread the batter in the pan and smooth the top. Bake 18 to 22 minutes, until the center looks set and a toothpick comes out with a few moist crumbs. Cool in the pan for at least 15 minutes, then lift out, slice into 9 or 16 squares, and enjoy.
Tips & Common Mistakes
- Use very ripe bananas with lots of spots for the best sweetness and banana aroma.
- Stir the cocoa thoroughly or sift it to avoid bitter dry pockets.
- Choose natural nut butter with just peanuts and salt to control sugar and texture.
- If the batter feels stiff, add 1 to 2 tablespoons mashed banana to loosen it.
- If you want extra sweetness, add 1 to 2 tablespoons maple syrup and bake on the longer end.
- Avoid overbaking or you will dry the edges; pull them when the center looks just set.
- Line the pan with parchment so you lift the slab cleanly without crumbling.
- Let the brownies cool before slicing so the fudgy interior sets.
Variations I've Tried
- Nut-free: Use sunflower seed butter and add 2 tablespoons maple syrup to balance the natural bite.
- Double chocolate: Fold in 1/2 cup mini chocolate chips.
- Mocha: Whisk 1 teaspoon instant espresso into the cocoa.
- Coconut twist: Add 1/3 cup shredded coconut and a pinch of salt.
- Walnut crunch: Fold in 1/3 cup chopped walnuts for texture.
- Peppermint: Stir in 1/4 teaspoon peppermint extract and top with crushed candies after baking.
How to Serve
Serve these banana brownies slightly warm with a scoop of vanilla ice cream or a dollop of Greek yogurt. Drizzle warm peanut butter on top for a quick frosting effect. Pair with hot coffee or a cold glass of milk for a cozy finish. Sprinkle flaky sea salt right before serving if you love that sweet-salty pop.
Make-Ahead and Storage
Let the brownies cool, then store them in an airtight container at room temperature for 2 days or in the fridge for up to 5 days. Freeze slices on a sheet pan until firm, then pack them in a freezer bag for up to 2 months. Reheat a square in the microwave for 10 to 15 seconds, or warm a small batch in a 300°F oven for 5 to 8 minutes until soft and fudgy again.
3 Ingredient Banana Brownies Recipe
Ingredients
Instructions
- Preheat the oven to 350°F (175°C). Line an 8-inch square metal baking pan with parchment paper and lightly grease so the brownies lift out cleanly. Set aside.
- Peel the bananas and place them in a medium mixing bowl. Mash with a fork or potato masher until mostly smooth with just small specks remaining. You should have about 1 1/2 cups mashed banana.
- Add the peanut butter and cocoa powder to the mashed bananas. Stir until the batter is thick, shiny, and evenly combined with no dry cocoa pockets. If using, stir in the salt, vanilla, chocolate chips, and maple syrup until evenly distributed.
- Spread the batter evenly into the prepared pan and smooth the top with a spatula. Bake for 18 to 22 minutes, or until the center looks just set and a toothpick inserted in the middle comes out with a few moist crumbs but no wet batter.
- Let the brownies cool in the pan for at least 15 minutes so the fudgy interior can set. Use the parchment to lift the slab from the pan, then slice into 9 to 16 squares and serve.
Notes
Approximate per 1 of 9 squares (without optional chocolate chips or maple syrup): 220 calories; fat 13 g; saturated fat 3 g; carbohydrates 23 g; fiber 5 g; sugars 13 g; protein 7 g; sodium 90 mg. Values will vary based on exact banana size, nut butter brand, and any add-ins. Storage: Cool completely, then store in an airtight container at room temperature for up to 2 days or in the refrigerator for up to 5 days. For longer storage, freeze squares in a single layer until firm, then transfer to a freezer bag for up to 2 months. Rewarm briefly in the microwave or a low oven until soft and fudgy again.