I’ve been making these flourless banana peanut butter brownies on nights when I want something fast, chocolatey, and strangely wholesome. The whole tray comes together with just three pantry items and 30 minutes of oven time, and they hit that nostalgic peanut-butter-and-banana spot without any flour or fuss. If you like easy peanut-based snacks, you might also enjoy this other simple treat I turn to for busy mornings: no-bake peanut butter energy bites.
Why you’ll love this dish
This recipe is a winner when you want dessert that feels indulgent but doesn’t require a trip to the grocery store. It’s flourless and naturally gluten free, uses only three main ingredients, and is budget friendly. The ripe bananas bring natural sweetness and moisture while peanut butter supplies protein and richness, and cocoa powder adds an intense chocolate punch. Make it for a weeknight treat, an after-school snack kids approve of, or a simple potluck offering that stands out for being both familiar and different.
Step-by-step overview
Before you mix anything, know that you will mash bananas, fold in peanut butter and cocoa until glossy, spread the batter in a small pan, and bake about 20 to 25 minutes. Expect a fudgy, slightly cakey texture; cooling fully is important so the brownies set and cut cleanly. Prep time is under 10 minutes, bake time about 20 to 25 minutes, and cooling time around 30 minutes.
What you’ll need
- 3 ripe bananas (very ripe, with brown speckles for best sweetness and flavor)
- 1 cup peanut butter (creamy or crunchy; see notes below)
- 1/2 cup unsweetened cocoa powder (use good-quality natural or Dutch-processed for deeper flavor)
Optional notes: If you want them sweeter, add 1 to 2 tablespoons maple syrup or honey. A pinch of salt or 1/2 teaspoon vanilla extract can enhance flavor. For a nut-free version, swap sunflower seed butter.
Directions to follow
- Preheat your oven to 350°F (175°C). Grease an 8×8-inch baking pan or line it with parchment paper so the brownies lift out easily.
- Peel and place the bananas in a large mixing bowl. Mash them with a fork until mostly smooth but with a few small lumps for texture.
- Add the peanut butter and the cocoa powder to the mashed bananas. Stir vigorously until the mixture is homogeneous and has a glossy sheen. Scrape the sides so everything is well combined.
- Pour the batter into the prepared pan and smooth the top with a spatula so it bakes evenly.
- Bake for 20 to 25 minutes. A toothpick or skewer inserted into the center should come out mostly clean with a few moist crumbs attached. Avoid overbaking to keep them fudgy.
- Cool the brownies completely in the pan on a wire rack before cutting into squares so they hold their shape.
Best ways to enjoy it
Serve warm with a scoop of vanilla ice cream and a sprinkle of flaky salt for contrast. For a lighter option, top with plain Greek yogurt and sliced bananas. They’re also excellent chopped and tossed into a bowl of oatmeal, or packed into lunchboxes with a few fresh berries on the side.
Storage and reheating tips
Store cooled brownies in an airtight container. At room temperature they stay fine for up to 2 days; refrigeration extends freshness to about 4 to 5 days because of the banana content. For longer storage, freeze individual squares on a tray, then transfer them to a freezer-safe bag for up to 3 months. To reheat, microwave a single square for 10 to 20 seconds or warm in a 300°F oven for 5 to 8 minutes until soft. Always refrigerate leftovers promptly and discard any pieces that smell off.
Helpful cooking tips
- Use very ripe bananas for maximum sweetness and moisture.
- If your peanut butter is the natural, oil-separated kind, stir it until smooth before measuring so texture is consistent.
- For an extra glossy batter and easier spreading, warm thick peanut butter briefly (10 seconds) in the microwave.
- Don’t skip cooling time; these brownies firm up as they cool and slice cleaner once fully set.
- If you prefer a cakier result, fold in 1 tablespoon of milk or milk alternative to lighten the batter slightly.
Creative twists
- Mix in 1/3 cup chocolate chips, chopped nuts, or shredded coconut before baking for texture.
- Stir 1/2 teaspoon instant espresso powder into the batter to deepen the chocolate flavor.
- Make them sweeter with a tablespoon or two of maple syrup, or add a tablespoon of peanut butter chips for bursts of nutty sweetness.
- For a portable snack with similar flavor notes, try a complementary recipe like no-bake peanut butter energy bites.
- Swap peanut butter for almond or cashew butter for a different nut profile, or use sunflower seed butter for a nut-free option.
Recipe variations
- Double-chocolate: add 1/4 cup cocoa nibs or extra chocolate chips.
- Banana-less fudge: replace bananas with 1/3 cup applesauce plus 1/4 cup extra peanut butter and a touch of sweetener.
- Spiced brownies: fold in 1/2 teaspoon cinnamon and a pinch of cayenne for warmth.
Common questions
Are these brownies truly flourless and gluten free?
Yes. The recipe contains no flour, so it’s naturally gluten free. Always verify that your cocoa powder and peanut butter are labeled gluten free if you need strict avoidance.
Can I use natural peanut butter with oil separation?
Yes. Stir natural peanut butter thoroughly before measuring. If it’s very oily and thin, chill the mixed batter briefly to help it firm up before baking.
How can I tell when they are done?
They are done when the edges pull slightly away from the pan and a toothpick inserted in the center comes out with a few moist crumbs but not wet batter. Overbaking makes them dry.
Can I make this ahead and freeze?
Yes. Cool fully, cut into squares, freeze on a tray until solid, then transfer to a freezer bag for up to 3 months. Thaw overnight in the fridge or at room temperature for an hour.
Are these suitable for kids and lunchboxes?
Absolutely. They are portable, have familiar flavors, and are a good option when you want to pack something homemade without added flour or long ingredient lists. Note that they contain peanuts, so they are not safe for nut-free settings.
Flourless Banana Peanut Butter Brownies
Ingredients
Method
- Preheat your oven to 350°F (175°C). Grease an 8x8-inch baking pan or line it with parchment paper.
- Peel and place the bananas in a large mixing bowl. Mash them with a fork until mostly smooth but with a few small lumps for texture.
- Add the peanut butter and the cocoa powder to the mashed bananas. Stir vigorously until the mixture is homogeneous and glossy.
- Pour the batter into the prepared pan and smooth the top with a spatula.
- Bake for 20 to 25 minutes. A toothpick or skewer inserted into the center should come out mostly clean with a few moist crumbs attached.
- Cool the brownies completely in the pan on a wire rack before cutting into squares.
