Sweet Potato Blondies with Maple Glaze

When a fork slides into a roasted sweet potato with almost no resistance, you know it’s soft enough to mash into a smooth, sweet base. The first time I made these, I was surprised by how much that one potato changes a familiar blondie: the centers stay tender, while cinnamon and brown sugar keep every bite unmistakably cozy. Sweet Potato Blondies with Maple Glaze are rich without feeling heavy, and the maple drizzle gives the tops a clean sweetness.

I roast the potato whole rather than boiling it, then measure the mashed flesh after it’s smooth. That gives me a reliable amount for the batter, instead of letting extra water sneak in and leave the bars gummy. The glaze goes on only after the blondies have cooled completely, so it stays on top instead of melting into the crumb. The finished squares are soft, warmly spiced, and striped with maple.

What the Extra Egg Yolk Changes in a Sweet Potato Blondie

A blondie can turn cakey when its batter leans too heavily on flour and egg white. Here, the extra yolk adds richness without bringing in another whole egg’s worth of white, helping the crumb stay dense and tender instead of springy like cake. The brown sugar supports that soft texture with moisture and a deep, molasses-like sweetness.

That balance matters because mashed sweet potato already brings moisture and body. The yolk gives the batter richness, while the flour and a small amount of baking powder give it enough structure to hold together once baked. Fold the dry ingredients in only until the last flour streaks disappear; beating the batter after that point can toughen the bars and make their crumb less delicate.

Think of the goal as a soft, close-textured bar, not a fluffy square. When you cut one, it should hold its shape but still feel tender at the center. The glaze adds a bright maple finish without asking the blondie itself to carry all the sweetness.

The Ingredients That Keep Sweet Potato Blondies From Turning Heavy

• Sweet potato — A small whole potato is easy to roast until tender, and its smooth flesh brings moisture and earthy sweetness. Scrub it before roasting, then peel and mash it well; stringy or lumpy pieces interrupt the soft crumb. The potato’s size can vary, so measure the mashed flesh rather than assuming one potato will yield the right amount.
• Unsalted butter and light brown sugar — Melted butter blends evenly into the sugar and keeps the batter simple to mix by hand. Standard grocery-store butter works well here; unsalted lets the recipe’s salt stay in balance. Pack the brown sugar firmly so the sweetness and moisture stay consistent from batch to batch.
• Egg and extra yolk — The whole egg helps bind the batter, while the additional yolk makes the bars feel richer. Fresh eggs from the grocery store are fine; there’s no specialty ingredient needed. Whisk them into the butter and sugar mixture rather than adding them to the flour.
• All-purpose flour and baking powder — All-purpose flour gives the blondies enough structure to slice, while baking powder supplies a little lift. A familiar, reliable all-purpose flour is all you need. Once it meets the wet mixture, fold gently and stop when no dry streaks remain.
• Cinnamon — Ground cinnamon gives the sweet potato a warm, familiar note without covering its flavor. If your jar smells faint or dusty instead of fragrant, a fresher one will make a noticeable difference; there’s no need to buy an unusually expensive brand.
• Pure maple syrup, powdered sugar, and milk — Pure maple syrup gives the glaze its distinct maple taste; pancake syrup won’t taste quite the same. Powdered sugar makes a smooth, sweet base, and milk loosens it enough to drizzle. Use a fresh, free-flowing maple syrup, but ordinary powdered sugar and milk work well.

From Roasted Potato to Set Maple Glaze: The Texture Cues That Matter

Roast Until the Sweet Potato Gives Easily

Heat the oven to 400°F and roast the scrubbed sweet potato on a rimmed baking sheet for 45 to 60 minutes. It’s ready when a fork slides into the thickest part with very little resistance. Let it cool until it’s easy to handle, then peel and mash the flesh until smooth. Measure 1/2 cup, and lower the oven temperature to 350°F for baking the blondies.

Mix the Wet and Dry Ingredients Separately

Grease an 8×8-inch baking pan and line it with parchment, leaving an overhang on two sides. Whisk the melted, slightly cooled butter with the brown sugar, then whisk in the egg, egg yolk, vanilla, and mashed sweet potato. In a separate bowl, whisk together the flour, baking powder, salt, and cinnamon. Keeping the dry mixture separate until this point makes it easier to distribute the cinnamon and baking powder evenly.

Fold Gently and Watch the Center

Fold the flour mixture into the sweet potato mixture just until you can’t see dry streaks, then spread the batter evenly in the pan. Bake at 350°F for 30 to 35 minutes. The edges should look set, and a toothpick inserted in the center should come out with a few moist crumbs rather than wet batter. A completely clean toothpick can mean the bars have baked longer than needed.

Cool Fully Before Adding the Glaze

Leave the blondies in the pan until they’re completely cool, about 2 hours. If the slab is still warm, the glaze will soften and run instead of sitting in a neat drizzle. Whisk the powdered sugar, maple syrup, and milk until smooth, then drizzle it over the cooled blondies. Give the glaze 15 to 20 minutes to set before cutting.

How to Change the Sweetness and Spice Without Losing the Blondie Texture

Questions That Come Up Before You Bake Sweet Potato Blondies

Sweet Potato Blondies with Maple Glaze

Sweet potato blondies with maple glaze are baked with roasted sweet potato and cinnamon for soft bars with set edges and a few moist crumbs. A smooth maple glaze is drizzled over the cooled blondies before cutting.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 1 hour hr 25 minutes mins

Cooling and glaze setting 2 hours hrs 18 minutes mins

Total Time 4 hours hrs 3 minutes mins

Servings: 16 servings

Course: Dessert

Cuisine: American

Calories: 200

Ingredients Equipment Method Notes

Ingredients

  

For the blondies

• 1 sweet potato small, about 6 ounces, scrubbed, to yield 1/2 cup mashed
• 0.5 cup unsalted butter melted and slightly cooled
• 1 cup light brown sugar packed
• 1 egg large
• 1 egg yolk large
• 1 tsp vanilla extract
• 1.5 cup all-purpose flour
• 0.5 tsp baking powder
• 0.5 tsp kosher salt
• 1 tsp ground cinnamon

For the maple glaze

• 1 cup powdered sugar
• 2 tbsp pure maple syrup
• 1 tbsp milk

Equipment

• 1 rimmed baking sheet
• 1 8x8-inch baking pan

Method

 

Make the blondies

1. Preheat the oven to 400°F.
2. Roast the sweet potato on a rimmed baking sheet for 45 to 60 minutes, until very tender when pierced with a fork.
3. Let the sweet potato cool until easy to handle.
4. Peel the sweet potato.
5. Mash the sweet potato until smooth and measure 1/2 cup.
6. Reduce the oven temperature to 350°F.
7. Grease an 8x8-inch baking pan.
8. Line the pan with parchment paper, leaving an overhang on two sides.
9. Whisk the melted butter and brown sugar in a large bowl until combined.
10. Whisk in the egg, egg yolk, vanilla, and mashed sweet potato.
11. Whisk together the flour, baking powder, salt, and cinnamon in a medium bowl.
12. Fold the flour mixture into the sweet potato mixture just until no dry streaks remain.
13. Spread the batter evenly in the prepared pan.
14. Bake at 350°F for 30 to 35 minutes, until the edges are set and a toothpick inserted in the center comes out with a few moist crumbs.
15. Cool completely in the pan, about 2 hours.

Make the maple glaze

1. Whisk the powdered sugar, maple syrup, and milk until smooth.
2. Drizzle the glaze over the cooled blondies.
3. Let the glaze set for 15 to 20 minutes before cutting.

Notes

For the best texture, measure the mashed sweet potato after mashing and stop baking when a toothpick comes out with a few moist crumbs. Store covered in the refrigerator for up to 5 days; freeze unglazed blondies for up to 3 months. For a dairy-free option, use dairy-free butter and milk.