Sweet Potato Brownies (No Flour, No Sugar, No Eggs)

These sweet potato brownies are everything a healthy brownie should be — rich, fudgy, deeply chocolatey — but made with no flour, no refined sugar, and no eggs. Instead, humble mashed sweet potato does the heavy lifting, giving these brownies their signature dense, moist crumb while loading every bite with fiber. If you have ever been let down by a “healthy” brownie that turned out dry or bland, this is the recipe that will change your mind.

They come together in one bowl (plus a blender), bake in about 25 minutes, and land at roughly 115 calories and 4 grams of fiber per brownie, with almost no sugar. They are naturally vegan and gluten-free, and the protein from peanut butter, oats, and flax makes them a genuinely satisfying treat rather than an empty one.

Why You’ll Love These Sweet Potato Brownies

• No flour, no oven-specialty ingredients — just blended oats and sweet potato do the work.
• No refined sugar — sweetened with monk fruit maple-style syrup, so they are naturally low in sugar.
• Egg-free and vegan — a simple flax egg binds everything together.
• High in fiber — sweet potato, oats, flax, and cocoa all contribute.
• Genuinely fudgy — not cakey, not dry, with that dense brownie bite.
• One bowl, under 40 minutes — easy enough for a weeknight.

Ingredients You’ll Need

Here is a quick look at the key players. Full measurements are in the recipe card below.

• Sweet potato — cooked and mashed until smooth. This is the base that replaces both flour and oil, and it is where most of the fiber and natural sweetness comes from.
• Quick oats — blended into a fine flour. This keeps the recipe gluten-free (use certified GF oats) and flour-free.
• Peanut butter — adds richness, healthy fats, and a little protein. Any natural nut butter works.
• Ground flaxseed — mixed with hot water to make a flax egg, which binds the batter in place of a real egg.
• Cocoa powder — for deep chocolate flavour. Unsweetened.
• Monk fruit maple-style syrup — a sugar-free liquid sweetener that keeps these low in sugar.
• Cornstarch & baking powder — for a little structure and lift.
• Optional: sugar-free chocolate chips and walnuts — for extra fudge and crunch.

How to Make Sweet Potato Brownies

The full step-by-step is in the recipe card, but here is the method at a glance so you know what to expect.

1. Make the flax egg. Stir the ground flaxseed into very hot water and set it aside for about 5 minutes to thicken.
2. Blend the oats. In a blender, blitz the quick oats into a fine flour, then transfer to a mixing bowl.
3. Mix the dry ingredients. Add the monk fruit sweetener, cocoa, cornstarch, salt, and baking powder to the oat flour and whisk well. Set aside.
4. Blend the sweet potato. In the same blender, blend the cooked sweet potato until completely smooth.
5. Combine. Add the blended sweet potato and the flax egg to the dry mixture and mix until you have a thick, smooth batter. If it looks dry with visible oat flour, add plant milk a splash at a time until it comes together.
6. Bake. Spread into a greased, lined tin, top with walnuts and chocolate chips if using, and bake at 350°F / 180°C for 20–25 minutes, until a toothpick comes out with just a few moist crumbs.

Tips for the Fudgiest Brownies

• Cool completely before slicing. This is the single most important tip. Flourless sweet potato brownies firm up as they cool — slicing warm gives you a gooey mess. For extra-clean, extra-dense slices, chill them in the fridge first.
• Blend the sweet potato until truly smooth. The smoother the puree, the smoother and fudgier the final texture.
• Add milk only if needed. Sweet potatoes vary in moisture. If your batter is stiff and dry, add plant milk a little at a time. If it is already spreadable, skip it.
• Do the toothpick test. You want a few moist crumbs, not wet batter — and not totally clean, or they may be overbaked.

Substitutions & Variations

• Nut butter: Swap peanut butter for almond, cashew, or sunflower seed butter (for a nut-free version).
• Sweetener: Any liquid sweetener works in place of monk fruit syrup; pure maple syrup will add a little natural sugar.
• Sweet potato: Plain canned sweet potato or pumpkin puree (no added sugar or spices) can be used in a pinch.
• Add-ins: Try a pinch of cinnamon, espresso powder to deepen the chocolate, or a sprinkle of flaky salt on top.

How to Store

Store cooled brownies in an airtight container in the fridge for up to 5 days — the cold keeps them dense and fudgy. They also freeze beautifully: wrap individually and freeze for up to 3 months, then thaw at room temperature.

Frequently Asked Questions

Are sweet potato brownies healthy?

These are made with real-food ingredients, no refined flour, and no added sugar. They are naturally high in fiber and lower in calories than traditional brownies, which makes them a great everyday treat — though, like any dessert, best enjoyed in moderation.

Can you taste the sweet potato?

No. Once blended smooth and combined with cocoa and peanut butter, the sweet potato disappears into a rich chocolate flavour. It provides moisture and structure, not a strong sweet-potato taste.

Can I make these without a blender?

A blender gives the smoothest oat flour and sweet potato puree, but you can use pre-made oat flour and very finely mashed sweet potato instead. The texture will be slightly more rustic.

Why are my brownies gooey in the middle?

Flourless brownies set as they cool. If they seem underdone straight from the oven, let them cool fully (or chill them) before slicing — they firm up considerably.

Are these brownies gluten-free?

Yes, as long as you use certified gluten-free oats. The recipe contains no wheat flour.

Sweet Potato Brownies (No Flour, No Sugar, Vegan)

Fudgy, naturally sweetened brownies made with no flour, no refined sugar, and no eggs. High in fiber and ready in under 40 minutes.

Prep: 15 minutes  |  Cook: 25 minutes  |  Total: 40 minutes  |  Makes: 16 brownies

Course: Dessert  |  Cuisine: Healthy / Vegan  |  Diet: Vegan, Gluten-Free, No Added Sugar

Ingredients

Flax egg

• 7 g ground flaxseed
• 45 ml very hot water

Dry ingredients

• 75 g quick oats (blended into flour)
• 30 g cocoa powder (unsweetened)
• 100 g monk fruit maple-style syrup
• 8 g cornstarch
• 4 g baking powder
• 3 g salt

Wet & to combine

• 240 g sweet potato, cooked and mashed
• 65 g peanut butter
• 10 ml vanilla extract
• 50 ml plant milk (only if the batter looks dry)

Optional

• 90 g sugar-free chocolate chips
• 60 g walnuts, chopped

Instructions

1. Make the flax egg: Add the ground flaxseed to the very hot water, stir, and set aside for 5 minutes to thicken.
2. Blend the oats: In a blender, blend the quick oats until they form a fine flour. Transfer to a mixing bowl.
3. Mix the dry ingredients: To the oat flour add the monk fruit sweetener, cocoa powder, cornstarch, salt, and baking powder. Mix well and set aside.
4. Blend the sweet potato: In the same blender, blend the cooked sweet potato until completely smooth.
5. Combine: Add the blended sweet potato, peanut butter, vanilla, and the flax egg to the dry mixture. Mix until you have a thick, smooth batter with no dry oat flour visible. If the batter is too stiff, add plant milk a splash at a time until it comes together.
6. Prepare the tin: Grease and line a baking tin with a little oil, then spread the batter evenly into it.
7. Add toppings (optional): Sprinkle over the walnuts and chocolate chips.
8. Bake: Bake in a preheated oven at 350°F / 180°C for 20–25 minutes. Do a toothpick test — it should come out with a few moist crumbs.
9. Cool: Let the brownies cool completely (or chill) before slicing, so they set into fudgy squares.

Notes

• Sweet potatoes vary in moisture — only add plant milk if your batter is dry.
• For the cleanest, fudgiest slices, refrigerate before cutting.
• Use certified gluten-free oats to keep these gluten-free.

Nutrition (per brownie, makes 16)

Calories: ~115  |  Carbohydrates: ~18 g  |  Protein: ~3–4 g  |  Fat: ~7 g  |  Fiber: ~4 g  |  Sugar: ~2 g

Nutrition is automatically estimated from the ingredients and should be used as an approximation. Values will vary with brands and optional add-ins.

If you make these sweet potato brownies, I’d love to hear how they turned out — leave a star rating and a comment below, and tag your bakes so I can see them!