These vegan black bean brownies are rich, fudgy and chocolatey, and they’re made with no flour, no oil and no added sugar. A can of black beans, cocoa, oats and peanut butter blend into one smooth batter in a food processor. Each brownie comes in around 140 calories with 6 grams of fiber.

Most healthy black bean brownie recipes still rely on coconut sugar, maple syrup or dates. This one is sweetened with monk fruit instead, so it’s refined-sugar-free and has no added sugar at all. It’s also eggless, dairy-free and gluten-free when you use certified gluten-free oats.

And yes, the most common question: once the beans are blended smooth and baked with cocoa, you can’t taste them.

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Quick recipe overview


Prep time	15 minutes
Bake time	25–30 minutes
Cool + chill time	1 hour 30 minutes
Total time	About 2 hours 15 minutes
Yield	9 brownies (8×8-inch pan)
Calories	About 140 per brownie
Protein	About 6 g per brownie
Diet	Vegan, eggless, dairy-free, oil-free, no added sugar, gluten-free with certified GF oats

Why you’ll love these black bean brownies

No added sugar. Monk fruit sweetener replaces sugar, maple and dates.
No flour and no oil. Oats and peanut butter give structure and richness instead.
Vegan and eggless. A flax egg binds the batter.
One food processor. Grind the oats, add everything else, blend and bake.
Fiber-rich. About 6 g of fiber per brownie from beans, oats, cocoa and flax.
Great for meal prep. They taste best chilled and keep well in the fridge.

Ingredients for black bean brownies

Black beans, 1 can (15 oz), drained and rinsed (about 1½ cups / 240 g). The base of the brownie: moisture, body and plant protein. Rinse until the water runs clear; this removes the canning liquid that causes a beany taste. Home-cooked black beans work too (1½ cups, well drained).
Rolled oats, ½ cup (40 g). Ground into flour right in the processor. They replace flour and absorb moisture so the brownies slice cleanly. Use certified gluten-free oats if you need the brownies gluten-free. Quick oats work the same way.
Unsweetened cocoa powder, ⅓ cup (28 g). Natural or Dutch-process both work. Dutch-process gives a darker color and a smoother, less bitter chocolate flavor.
Natural peanut butter, ⅓ cup (85 g). Adds fat and richness since there’s no oil. Choose a drippy, stir-style peanut butter with just peanuts and salt. Almond or cashew butter swap in 1:1.
Ground flaxseed, 2 tbsp (14 g) + water, 5 tbsp (75 ml). This is the flax egg that holds the brownies together. Use ground flaxseed (flax meal), not whole seeds.
Granulated monk fruit sweetener, ½ cup (96 g). Use a cup-for-cup granulated blend (most US brands blend monk fruit with erythritol). Pure monk fruit extract is far sweeter and is not a 1:1 swap.
Unsweetened almond milk, ¼ cup (60 ml). Loosens the batter so it blends smooth. Any unsweetened plant milk works.
Vanilla extract, 1 tsp.
Baking powder, 1 tsp. Gives a little lift so the brownies aren’t dense like fudge.
Salt, ¼ tsp. Sharpens the chocolate flavor.
Sugar-free, dairy-free chocolate chips, ⅓ cup (55 g), divided. Check the label: some sugar-free chips contain milk.

Equipment

Food processor (a high-speed blender also works; see tips)
8×8-inch baking pan
Parchment paper
Small bowl for the flax egg
Spatula
Toothpick
Wire rack

How to make black bean brownies

Heat the oven and line the pan. Preheat the oven to 350°F (175°C). Line an 8×8-inch pan with parchment, leaving some overhang on two sides so you can lift the brownies out.
Make the flax egg. Stir the ground flaxseed and water together in a small bowl. Let it sit for 5 minutes. It’s ready when it looks thick and gel-like, similar to a raw egg white.
Grind the oats. Pulse the rolled oats in the food processor for 30–60 seconds until they turn into a fine flour with no whole flakes left.
Blend the batter. Add the black beans, peanut butter, cocoa, monk fruit, almond milk, vanilla, baking powder, salt and the flax egg. Blend for about 2 minutes, stopping twice to scrape down the sides. The batter is ready when it is completely smooth and glossy, like thick frosting, with no visible bean skins.
Add the chocolate chips. Stir in two-thirds of the chips by hand. Spread the batter into the pan and smooth the top with a wet spatula. Scatter the remaining chips on top.
Bake. Bake for 25–30 minutes. They’re done when the edges are set and pulling slightly away from the pan, the center no longer looks wet, and a toothpick comes out with moist crumbs but no wet batter.
Cool completely. Cool in the pan on a wire rack for 30 minutes. They will look soft; that’s normal.
Chill, then slice. Refrigerate for at least 1 hour. Chilling is what turns them dense and fudgy. Lift out with the parchment and cut into 9 squares.

Tips for the best black bean brownies

Rinse the beans well. This is the single biggest factor in whether you taste beans.
Blend longer than you think. Graininess almost always means the batter wasn’t blended long enough. Scrape down the bowl and keep going.
Use drippy peanut butter. Thick, no-stir peanut butter makes a stiff batter that’s harder to blend smooth.
Don’t overbake. The center should look just set. Overbaking makes them dry and cakey.
Chill before cutting. Warm black bean brownies are mushy. Cold ones are fudgy.
Wipe the knife between cuts for clean edges.

Common mistakes

Problem	Why it happens	How to fix it
Brownies taste like beans	Beans weren’t rinsed, or batter wasn’t fully blended	Rinse until water runs clear; blend a full 2 minutes
Gritty texture	Oats or bean skins not fully broken down	Grind oats to fine flour first; blend batter longer
Mushy in the middle	Cut while warm, or underbaked	Cool 30 min and chill 1 hour; check with a toothpick
Dry and cakey	Overbaked	Pull them when the center just looks set
Falling apart	Flax egg didn’t gel, or skipped the chill	Let the flax egg sit 5 min; chill before slicing
Cooling aftertaste	Erythritol in the monk fruit blend	Chill fully before serving; the cooling effect is less noticeable cold

Substitutions

Original	Substitute	Amount	Effect	Recommended?
Peanut butter	Almond or cashew butter	1:1	Milder flavor	Yes
Peanut butter	Sunflower seed butter	1:1	Nut-free; may turn slightly green when baked (harmless)	Yes, for nut-free
Flax egg	Chia egg (2 tbsp ground chia + 5 tbsp water)	1:1	Slightly darker specks	Yes
Rolled oats	Quick oats	1:1	No change	Yes
Almond milk	Any unsweetened plant milk	1:1	No change	Yes
Monk fruit blend	Allulose-based blend	1:1	Softer, more gooey; browns faster	Not tested for this recipe
Monk fruit blend	Coconut sugar or maple syrup	Not 1:1	No longer “no added sugar”; changes moisture	Not tested for this recipe
Cocoa powder	Raw cacao powder	1:1	More bitter	Okay

Variations

Mocha: add 1 tsp instant espresso powder to the batter.
Nutty: fold in ¼ cup chopped walnuts or pecans with the chips.
Peanut butter swirl: drop 2 tbsp peanut butter on top before baking and swirl with a knife.
Mint chocolate: add ½ tsp peppermint extract.
Black bean banana brownies: replace the almond milk with ¼ cup mashed ripe banana. Banana adds natural fruit sugar and a banana flavor. Not yet tested; confirm before publishing.

How to store black bean brownies

Fridge: store in an airtight container for up to 5 days. They taste best cold.
Freezer: wrap individually or layer with parchment in a freezer container for up to 3 months.
To thaw: leave in the fridge overnight, or at room temperature for about 30 minutes.

Make-ahead and meal prep

Bake them the day before you need them; the overnight chill actually improves the texture. For meal prep, cut all 9 squares, wrap them individually and freeze. Pull one out in the morning and it’s ready by the afternoon.

Serving suggestions

Cold, straight from the fridge
With a scoop of dairy-free vanilla ice cream
Topped with fresh raspberries or strawberries
With a spoon of coconut yogurt
Crumbled over a smoothie bowl

Nutrition information (per brownie, 1 of 9)

Nutrient	Amount
Calories	About 140
Protein	6 g
Carbohydrates	14 g (plus about 12 g erythritol from the sweetener and chips)
Total fat	8 g
Saturated fat	2.5 g
Fiber	6 g
Sugar	1 g
Added sugar	0 g
Sodium	About 220 mg

Nutrition information is an estimate and may vary depending on the brands and ingredients used. Calculated with regular canned black beans (rinsed), natural peanut butter with salt, a granulated monk fruit–erythritol blend, and stevia-sweetened dairy-free chocolate chips.

What the nutrition means

The fiber comes mostly from the black beans, cocoa and oats. The protein comes from the beans and peanut butter, which makes these a solid snack but not a high-protein brownie. There is no added sugar; the small amount of sugar is naturally occurring in the beans, oats and peanut butter. The carbohydrate figure leaves out erythritol, which most US labels list separately as a sugar alcohol.

Frequently asked questions

Can you taste the black beans? No, as long as you rinse the beans well and blend the batter completely smooth. The cocoa and peanut butter take over.

Are black bean brownies healthy? These are a better-for-you dessert: no added sugar, no oil, no flour, and about 6 g of fiber each. They’re still a treat, so enjoy them as one.

How much protein is in these black bean brownies? About 6 g per brownie. If you want a higher-protein brownie, try my High Protein Bean Brownies with 11 g protein each.

Are black bean brownies gluten-free? Yes, if you use certified gluten-free oats. Regular oats can be cross-contaminated with wheat.

Can I make black bean brownies without a food processor? Yes. A high-speed blender works; add the almond milk first so the blades catch.

Can I make them without peanut butter? Use almond butter, cashew butter or sunflower seed butter in the same amount.

Can I use sugar or maple syrup instead of monk fruit? This recipe hasn’t been tested that way. Liquid sweeteners make the batter wetter, and the brownies would no longer be no-added-sugar.

Why are my black bean brownies mushy? They were likely cut while warm or slightly underbaked. Cool them fully and chill for at least an hour before slicing.

Can I freeze black bean brownies? Yes, for up to 3 months. Wrap them individually and thaw in the fridge.

Can I use a different bean? Kidney beans and chickpeas both work in brownies. See my bean brownies and chickpea brownies.

Final thoughts

If you’ve wanted a brownie that’s fudgy and chocolatey but made with no added sugar, no flour and no oil, these vegan black bean brownies are it. Blend, bake, chill, and see if anyone guesses what’s inside.