A vegetable in a brownie sounds like a trick, and most people are suspicious until the first bite. Then they notice what is missing: no butter, no oil, no wheat flour, and yet the square in their hand is dense, fudgy and very chocolatey. This sweet potato brownie recipe gets its moisture and much of its body from roasted sweet potato, with almond butter for richness and maple syrup for sweetness.
It is a one-bowl batter, it bakes in under half an hour, and it does not taste like sweet potato. The cocoa takes over completely. What the potato leaves behind is texture: a soft, almost truffle-like center that holds together well once cooled.
Why Sweet Potato Works in Brownies
In a classic brownie, butter and eggs carry the fat and moisture, and flour holds it all together. Mashed sweet potato can do part of each job. It is naturally sweet, it is full of starch that sets as it bakes, and it adds moisture without making the batter greasy. Paired with a nut butter, it replaces the butter entirely.
The result sits somewhere between a fudgy brownie and a flourless chocolate cake. It will not rise much, and it is not meant to be cakey. If you prefer a fluffier, cake-style square, this is not that recipe.
Roasted, Steamed or Canned: Which Sweet Potato to Use
How you cook the sweet potato matters more than most recipes admit. The goal is a thick, smooth purée with as little extra water as possible.
| Method | How to do it | Result in the brownies |
|---|---|---|
| Roasted (best) | Prick whole potatoes, bake at 400°F for 45 to 60 minutes until very soft, then scoop and mash | Deepest flavor, driest purée, fudgiest texture |
| Microwaved | Prick and microwave 6 to 9 minutes, turning once, until soft | Very close to roasted and much faster |
| Canned purée | Use 1 cup plain sweet potato purée, not pie filling or candied yams in syrup | Convenient and consistent; slightly wetter, so bake toward the longer time |
| Boiled | Not recommended | Absorbs water and can make brownies gummy |
Roast a few extra while the oven is on. Mashed sweet potato keeps for about 4 days in the fridge, so you can bake the brownies later in the week. If you have extra purée, it also works in recipes like this Seminole pumpkin recipe.
Ingredients You Need
Exact amounts are in the recipe card. A few notes on the choices that make the biggest difference:
- Almond butter. Use a creamy, drippy, well-stirred jar. Thick or dry nut butter from the bottom of the jar will make the batter stiff. Peanut butter works and gives a more noticeable peanut flavor.
- Cocoa powder. Either natural or Dutch-process cocoa works here. Dutch-process gives a darker color and a rounder, less sharp chocolate flavor.
- Almond flour. A small amount helps the brownies hold their shape. Blanched, finely ground almond flour gives the smoothest crumb.
- Maple syrup and coconut sugar. The syrup keeps the batter moist; the granulated sugar helps form a thin, crackly top. Light brown sugar is a fine substitute for coconut sugar.
- Dark chocolate chips. They add pockets of melted chocolate and make the brownie taste richer. Choose dairy-free chips if you need the whole recipe dairy-free.
How to Make Sweet Potato Brownies
1. Make the sweet potato base
Whisk the mashed sweet potato and almond butter together first, before anything else goes in. This is the moment to get rid of every lump. Any fibrous strands or chunks of potato left now will show up as pale streaks in the finished brownies.
2. Add the sweeteners and eggs
Whisk in the maple syrup, coconut sugar, eggs and vanilla. Keep going until the batter turns glossy. Room-temperature eggs blend in more easily; cold eggs can make the nut butter seize slightly.
3. Fold in the dry ingredients
Add the cocoa, almond flour, baking powder and salt, then switch to a spatula. Stir only until the dry streaks disappear. The batter should be thick, like a soft frosting, and it will not pour.
4. Bake, then wait
Spread the batter into a parchment-lined 8×8-inch pan, top with a few extra chips and bake at 350°F for 25 to 30 minutes. They are done when the edges are firm and a toothpick from the center comes out with moist crumbs.
Then comes the hardest part: letting them cool. Sweet potato brownies are very soft and fragile while warm, and they set as they cool. Give them at least an hour, and if you want clean, sharp squares like the ones in these photos, chill them for 30 minutes before slicing.
Sweet Potato Brownie Troubleshooting
| Problem | Likely cause | Fix next time |
|---|---|---|
| Gummy or wet center | Watery purée, or cut while still warm | Roast instead of boil; cool fully and chill before cutting |
| Dry and crumbly | Overbaked, or a thick, dry nut butter | Start checking at 25 minutes; use a runny, well-stirred nut butter |
| Tastes like sweet potato | Under-ripe or very large, starchy potato; too little cocoa | Use a deep-orange variety and measure the cocoa generously |
| Streaks of orange in the brownie | Lumps of potato not fully mashed | Whisk the potato and nut butter until completely smooth first |
| No crackly top | Too little granulated sugar, or sugar replaced entirely with syrup | Keep the coconut or brown sugar in the recipe |
Easy Variations
- Nut-free: use sunflower seed butter and replace the almond flour with oat flour, and skip the nuts. Sunflower butter can turn slightly green when it reacts with baking powder; it is harmless.
- Mocha: whisk 1 teaspoon instant espresso powder into the wet ingredients.
- Spiced: add 1/2 teaspoon cinnamon and a pinch of cayenne for a Mexican hot chocolate feel.
- Swirled: drop spoonfuls of extra nut butter on top of the batter and swirl with a knife before baking.
- Frosted: spread cooled brownies with melted dark chocolate and a pinch of flaky salt.
How to Store Sweet Potato Brownies
Because of the sweet potato and eggs, these brownies are moister than a classic brownie and keep best in the fridge. Store them in an airtight container for up to 1 day at room temperature or up to 5 days refrigerated. Many people prefer them cold, when the texture turns even fudgier.
To freeze, wrap individual squares in plastic wrap, place them in a freezer bag and freeze for up to 3 months. Thaw in the fridge overnight or at room temperature for about 30 minutes.
Looking for more bakes that use fruit or vegetables for moisture? Try these applesauce oatmeal bars, a loaf of Gold Medal banana bread, or, if you have almond flour left over, these gluten-free almond flour doughnuts. For a richer chocolate treat, there is always Carnation fudge.
Sweet Potato Brownie Recipe
Fudgy Sweet Potato Brownies
Equipment
- 8×8-inch metal baking pan
- Parchment paper
- Large mixing bowl and whisk
Ingredients
Wet ingredients
- 1 cup mashed roasted sweet potato about 1 medium potato (10 to 12 oz), cooled; or canned sweet potato purée
- 1/2 cup creamy almond butter well stirred; peanut or cashew butter also works
- 1/3 cup maple syrup
- 1/3 cup coconut sugar or light brown sugar
- 2 large eggs room temperature
- 1 tsp vanilla extract
Dry ingredients
- 1/2 cup unsweetened cocoa powder natural or Dutch-process
- 1/3 cup almond flour blanched, finely ground
- 1/2 tsp baking powder
- 1/4 tsp fine salt plus flaky salt for topping, optional
Mix-ins
- 2/3 cup dark chocolate chips divided; use dairy-free chips if needed
- 1/3 cup walnuts or pecans chopped, optional
Instructions
- Heat the oven to 350°F. Line an 8×8-inch metal pan with parchment, leaving some overhang on two sides so you can lift the brownies out.
- In a large bowl, whisk the mashed sweet potato and almond butter until completely smooth, with no visible lumps of potato.
- Whisk in the maple syrup, coconut sugar, eggs and vanilla until glossy and well combined.
- Sift or sprinkle in the cocoa powder, almond flour, baking powder and salt. Stir with a spatula just until no dry streaks remain. The batter will be thick.
- Fold in about 1/2 cup of the chocolate chips and the nuts, if using. Spread the batter evenly in the pan and scatter the remaining chips on top.
- Bake for 25 to 30 minutes, until the edges are set and a toothpick inserted in the center comes out with moist crumbs but no wet batter.
- Cool in the pan on a rack for at least 1 hour. For clean squares, refrigerate for another 30 minutes, then lift out and cut with a sharp knife wiped between cuts. Sprinkle with flaky salt if you like.
Notes
Frequently Asked Questions
Can you taste the sweet potato in these brownies?
Not really. With half a cup of cocoa and dark chocolate chips, the chocolate dominates. Most people notice only the soft, fudgy texture.
Are sweet potato brownies gluten-free?
This version uses almond flour instead of wheat flour, so it contains no gluten ingredients. If you bake for someone with celiac disease, check that your cocoa, chocolate chips and baking powder are labeled gluten-free.
Can I use all-purpose flour instead of almond flour?
Yes, replace the almond flour with 1/4 cup all-purpose flour. The brownies will be slightly firmer and a little less rich.
Can I make sweet potato brownies without eggs?
You can try two flax eggs (2 tablespoons ground flaxseed mixed with 5 tablespoons water, rested 10 minutes). Expect a softer, more fragile brownie that needs a full chill before cutting.
Can I use canned yams?
Only if they are plain purée. Canned yams packed in syrup are too wet and too sweet; drain them very well and mash until smooth if that is all you have, and expect a softer result.
Why are my sweet potato brownies so soft?
They are naturally softer than butter-based brownies, especially when warm. Let them cool for an hour and then chill them; they firm up considerably in the fridge.
Once you have made this sweet potato brownie recipe one time, the method is easy to remember: smooth potato, nut butter, sweetener, eggs, cocoa, bake and wait. The waiting is the only part that takes patience.
