These sweet potato brownies are rich, chocolatey, and soft in the middle, with a generous scattering of chocolate chips on top. Smooth roasted sweet potato adds moisture to the batter, while cocoa and melted butter give the brownies their deep flavor and dense texture. Once they have cooled, they cut into neat squares that are just as good with coffee as they are with a scoop of ice cream.
You do not need a blender full of unusual ingredients to make them. This recipe uses regular flour, eggs, butter, and sugar, plus a cup of cooked sweet potato. It is a chocolate dessert with sweet potato in the batter, rather than a sugar-free or flourless brownie. The method is straightforward, and the most useful trick is allowing plenty of time for the brownies to cool.
Recipe at a glance
- Yield: 16 small brownies
- Prep time: 15 minutes, using cooked, cooled sweet potato
- Bake time: 28–35 minutes
- Cooling time: at least 1 hour
- Total time: about 1 hour 50 minutes, excluding cooking and cooling the sweet potato
- Pan: 8 × 8-inch light-colored metal baking pan
- Oven: 350°F (175°C)
Why sweet potato works in brownies
Cooked sweet potato becomes smooth and thick when mashed, which makes it easy to fold into chocolate batter. It brings moisture and a little natural sweetness without needing much extra liquid. Roasting concentrates its flavor, while a well-mashed texture helps it blend into the cocoa.
The sweet potato does not replace every other brownie ingredient. Butter still supplies richness, eggs help the squares set, and a modest amount of flour gives them enough structure to slice. With no need for a large dose of baking powder, the result stays closer to a dense brownie than a fluffy chocolate cake.
Ingredients
- 1 cup (240 g) smooth cooked sweet potato puree, cooled to room temperature
- 1/2 cup (113 g) unsalted butter, melted and cooled slightly
- 3/4 cup (150 g) granulated sugar
- 2 large eggs, at room temperature
- 1 teaspoon vanilla extract
- 1/2 cup (65 g) all-purpose flour
- 1/2 cup (45 g) unsweetened natural cocoa powder
- 1/4 teaspoon baking powder
- 1/2 teaspoon fine salt
- 3/4 cup (130 g) semisweet or dark chocolate chips, divided
Ingredient notes and simple swaps
Sweet potato: Use an orange-fleshed variety such as Garnet or Jewel. Measure the cooked flesh after mashing, rather than measuring raw cubes. The puree should be smooth and thick enough to hold a soft mound on a spoon. Watery puree can make the center gummy.
Cocoa: Unsweetened natural cocoa gives these brownies a rounded chocolate flavor. Hot chocolate mix is not a substitute because it contains sugar and other ingredients. Break up any cocoa lumps before adding it to the batter.
Butter: Let melted butter cool until warm, not hot, before mixing it with the eggs. Salted butter can be used, but reduce the added salt to 1/4 teaspoon.
Chocolate chips: Semisweet chips give a sweeter finish, while dark chips make the brownies taste more intense. Reserve some for the top so the finished squares have visible chocolate pieces, like the brownie in the featured photo.
Flour: Weigh it when possible. If using a cup, spoon the flour into it and level the top; scooping directly from the bag can pack in more flour and make the brownies drier.
How to prepare the sweet potato
Scrub 1 large or 2 medium sweet potatoes, pierce the skins a few times, and place on a lined baking sheet. Roast at 400°F (200°C) for about 45–60 minutes, depending on size, until a knife slides through the middle without resistance. Split them open, allow the steam to escape, then scoop out the flesh.
Mash thoroughly with a fork or potato masher, or briefly process the flesh until smooth. Do not add milk or water. Let it cool to room temperature, then weigh or measure 1 cup for the recipe. Extra puree can be refrigerated for another use. If making it ahead, refrigerate promptly and use within 3–4 days.
For a quicker option, microwave a pierced sweet potato on a microwave-safe plate in short intervals, turning as needed, until soft throughout. Timing varies with the potato and microwave. Allow it to cool before handling, then mash and measure as above.
How to make sweet potato brownies
Step 1: Prepare the puree and pan
Heat the oven to 350°F (175°C). Lightly grease an 8 × 8-inch metal baking pan and line it with parchment, leaving enough overhang on two sides to lift out the brownies later. Measure 1 cup of the cooled, smooth sweet potato puree.
A metal pan gives more predictable baking than a deep glass or ceramic dish. If you use another type of pan, start checking at the earlier end of the baking window and rely on the signs of doneness rather than the clock alone.
Step 2: Whisk the wet ingredients
In a large bowl, whisk the sweet potato puree, melted butter, and sugar until evenly combined. Add the eggs and vanilla and whisk until smooth, about 30–45 seconds. Scrape the sides and bottom of the bowl so no pockets of puree remain.
You only need to blend everything together. There is no need to whip the mixture until fluffy; too much incorporated air works against the dense texture you want here.
Step 3: Combine the dry ingredients
In a separate bowl, whisk the flour, cocoa powder, baking powder, and salt. If the cocoa has stubborn lumps, sift it first. An evenly mixed dry bowl helps you avoid overworking the batter in the next step.
Keep the baking powder to the small amount listed. Adding more will not improve the fudgy texture and can make the brownies rise more like cake.
Step 4: Fold the batter and chocolate chips
Add the dry ingredients to the sweet potato mixture. Fold with a flexible spatula just until you no longer see dry flour or cocoa. The batter should be thick and spreadable. Fold in 1/2 cup of the chocolate chips, reserving the remaining 1/4 cup for the top.
Stop mixing once the chips are distributed. Avoid thinning the batter with milk; the sweet potato already supplies plenty of moisture.
Step 5: Fill the pan
Scrape the batter into the prepared pan and spread it all the way into the corners. Smooth the top with the spatula, then scatter the reserved chocolate chips over it. Press the chips very lightly into the surface so they stay in place.
The batter will not level itself like a thin cake batter, so take a moment to make the thickness even. This helps the center and edges finish baking closer together.
Step 6: Bake, cool, and slice
Bake on the middle rack for 28–35 minutes. Start checking at 28 minutes. The edges should look set, the surface should no longer look wet, and a toothpick inserted near the center should come out with moist crumbs rather than streaks of raw batter. Test away from a melted chocolate chip, which can make a finished brownie look underbaked.
Cool in the pan on a wire rack for at least 1 hour, or until fully cool, before lifting out with the parchment. Slice into 16 squares with a sharp knife, wiping the blade between cuts. For firmer, especially neat squares, chill the cooled slab for 30–60 minutes before slicing.
Tips for fudgy brownies
- Use smooth puree. Fibrous pieces can remain noticeable even after baking. Mash thoroughly before measuring.
- Let the puree cool. Hot sweet potato and hot butter can begin cooking the eggs and melt all the chips into the batter.
- Measure carefully. Too much flour makes the brownies drier, while extra puree can leave the middle heavy and sticky.
- Do not wait for a perfectly clean toothpick. A few moist crumbs are the goal. A completely dry tester can mean the brownies have baked too long.
- Cool before cutting. The center sets further as it cools. Warm brownies can seem much softer than their final texture.
- Expect a soft, dense crumb. Sweet potato brownies are a little different from chewy boxed brownies, even when both are richly chocolatey.
Variations worth trying
With walnuts: Fold in 1/3 cup chopped walnuts along with the chips. Toast and cool the nuts first if you want a deeper flavor.
With coffee: Whisk 1 teaspoon instant espresso powder into the dry ingredients for a stronger chocolate impression. It is optional, and the brownies are still full-flavored without it.
With a peanut butter swirl: Dot 2 tablespoons of smooth, slightly warmed peanut butter over the filled pan and drag a knife through it a few times. Avoid stirring it all the way in.
Gluten-free option: A baking blend labeled as a cup-for-cup substitute for all-purpose flour may work, though the texture can differ by brand. Check every packaged ingredient if avoiding gluten. Almond flour and coconut flour are not direct substitutes for this recipe.
Serving ideas
Serve the brownies plain at room temperature to appreciate the soft center, or warm a square briefly and add vanilla ice cream. Fresh berries bring a little tartness alongside the chocolate. For a dessert platter, cut some pieces smaller and pair them with another baked treat, such as our easy mini apple pies.
Storage and freezing
Once fully cooled, store the brownies in an airtight container in the refrigerator for up to 4 days. Place parchment between layers so the tops do not stick together. Let a portion stand at room temperature briefly before serving if you prefer a softer texture.
For longer storage, wrap individual squares and freeze in a sealed container or freezer bag for up to 2–3 months for best quality. Thaw in the refrigerator, then bring to your preferred serving temperature. A few seconds in the microwave can soften the chocolate chips; heat gently so the edges do not dry out.
Frequently asked questions
Do sweet potato brownies taste like sweet potatoes?
Cocoa and chocolate chips provide the main flavor, though the sweet potato adds a mild earthy sweetness. The exact flavor depends on your potato and cocoa. Roasting the potato and using good unsweetened cocoa help keep the chocolate prominent.
Can I use canned sweet potato?
Use plain, unsweetened sweet potato puree if available, with no added syrup or spices. Drain well if starting with canned pieces, then mash smoothly. Avoid canned sweet potato pie filling because the extra sugar and seasonings change the recipe.
Can I replace the sugar with maple syrup?
Not as a direct swap here. Maple syrup adds liquid, which can make an already moist batter too wet. This recipe is balanced around granulated sugar.
Are these brownies vegan or flourless?
No. This version contains eggs, butter, and all-purpose flour. Sweet potato contributes moisture, but it does not automatically make a brownie vegan, gluten-free, or sugar-free.
Why is the center gummy?
Too much puree, watery puree, underbaking, or slicing while warm can all contribute. Check the measurements, bake until there are moist crumbs rather than raw batter on the tester, and let the slab cool completely before judging the texture.
Can I double the recipe?
Two 8-inch square pans are the easiest way to preserve the thickness and baking time. A larger pan changes the depth of the batter, so baking time will need adjustment. Check each pan separately for doneness.