Easy Sweet Potato Honeybun Cake (Moist & Spiced)

If you love the gooey, cinnamon-sugar goodness of a classic honey bun and the warm, comforting spices of a sweet potato pie, this dessert is going to blow you away. A Sweet Potato Honeybun Cake is the ultimate mashup of two beloved Southern classics. It takes the incredibly easy, foolproof method of a boxed cake mix hack and elevates it with real mashed sweet potatoes, resulting in a cake that is outrageously moist, richly spiced, and dripping with a sweet vanilla glaze.

What is it

A traditional honey bun cake is a popular 9×13 sheet cake made by doctoring up a boxed yellow cake mix and adding a thick ribbon of brown sugar and cinnamon through the middle. This Sweet Potato Honeybun Cake takes that exact concept but folds smooth, creamy mashed sweet potatoes directly into the batter along with rich sour cream and warm spices. As it bakes, the brown sugar filling melts into the sweet potato batter, creating a sticky, gooey ribbon of caramel-like flavor throughout the incredibly tender cake.

Why you’ll love it

• Unbelievably Moist: The combination of vegetable oil, sour cream, and fresh sweet potato puree guarantees this cake will never dry out.
• Easy Box Mix Hack: Starting with a yellow cake mix saves time without sacrificing flavor, making this an easy weeknight bake.
• Warm Fall Flavors: The blend of cinnamon, nutmeg, and brown sugar perfectly complements the earthy sweetness of the sweet potatoes.
• Versatile: Serve it warm for a cozy dessert, or enjoy a slice alongside a hot cup of coffee for a sweet breakfast—similar to a slice of our Moist Coffee Cake.

Ingredients

Do not be intimidated by the ingredient list; most of these are simple pantry staples!

For the Sweet Potato Cake:

• 1 box (15.25 oz) Yellow Cake Mix: Do not prepare according to the box instructions; just use the dry mix.
• 1 cup Mashed Sweet Potatoes: You can bake or boil them until tender, then mash them smoothly. Canned sweet potato puree works perfectly too!
• 1 cup Sour Cream: Adds richness and moisture.
• ¾ cup Vegetable Oil or Canola Oil: Keeps the crumb tender.
• 4 Large Eggs & 1 tsp Vanilla Extract: For structure and flavor.

For the Brown Sugar Swirl:

• 1 cup Light or Dark Brown Sugar.
• 2 teaspoons Ground Cinnamon & ½ tsp Ground Nutmeg: Essential for that “honey bun” flavor.
• ¼ cup Finely Chopped Pecans (Optional): Adds a wonderful crunch.

For the Glaze:

• 1 ½ cups Powdered Sugar, 3-4 tbsp Milk, & 1 tsp Vanilla Extract.

How to make

The secret to this cake is the beautiful swirl. Follow these easy steps:

1. Prep: Preheat your oven to 350°F (175°C). Generously grease a 9×13-inch baking pan with nonstick baking spray.
2. Make the Batter: In a large mixing bowl (or stand mixer), beat the dry yellow cake mix, sour cream, vegetable oil, eggs, and vanilla extract until smooth. Gently fold in the mashed sweet potatoes until fully incorporated.
3. Make the Swirl Mixture: In a small, separate bowl, whisk together the brown sugar, cinnamon, nutmeg, and chopped pecans.
4. Layer the Cake: Pour exactly half of the sweet potato cake batter into your prepared baking pan, spreading it evenly. Sprinkle the brown sugar mixture evenly over this bottom layer.
5. Top and Swirl: Pour the remaining half of the batter over the brown sugar layer. Use a butter knife or skewer to gently drag through the batter, swirling the sugar mixture up into the cake. Do not over-mix!
6. Bake: Bake for 35-45 minutes, or until a toothpick inserted into the center comes out clean.
7. Glaze: While the cake is still warm, whisk together the powdered sugar, milk, and vanilla. Drizzle the glaze evenly over the warm cake.

How To Serve

This cake is absolute perfection when served slightly warm, allowing the glaze to melt into the crumb. For a decadent after-dinner dessert, serve a warm slice topped with a giant scoop of Cookies and Cream Ice Cream or a dollop of Chantilly Mascarpone to balance the sweet cinnamon spices. If you have leftovers, it makes a phenomenal morning treat alongside a hot cup of coffee.

How To Store

• Room Temperature: Allow the cake to cool completely, then cover the 9×13 pan tightly with plastic wrap or aluminum foil. It will stay incredibly moist at room temperature for up to 4 days.
• Refrigerator: You can store the covered cake in the fridge for up to 1 week. Because of the sweet potato puree, chilling it can help it last longer, though you should microwave individual slices for 15 seconds before eating to restore that fresh-baked softness.
• Freezer: This cake freezes beautifully! You can freeze the entire baked, glazed cake (wrapped tightly in plastic wrap and foil) for up to 3 months. Thaw overnight on the counter before serving.

FAQs

Can I use leftover candied sweet potatoes?

Yes! Just be sure to mash them very well and measure out exactly 1 cup. Keep in mind that candied yams already contain sugar and spices, so your cake will be slightly sweeter.

My sweet potatoes are stringy. How do I fix this?

Stringy sweet potatoes will ruin the texture of your cake. To fix this, pulse the baked sweet potato meat in a food processor or blender until it is completely smooth and silky before adding it to the cake batter.

Do I have to use a yellow cake mix?

Yellow cake mix provides a buttery base that mimics a real honey bun. However, a white cake mix or a spice cake mix will also work in a pinch!

Note

When swirling the brown sugar filling into the batter, use a gentle hand. If you swirl too aggressively, the brown sugar will simply blend into the batter rather than creating distinct, gooey pockets of cinnamon-sugar.

Nutrition information

(Estimates based on 1 slice – 1/15th of 9×13 pan)

• Calories: 340 kcal
• Carbohydrates: 48 g
• Sugars: 35 g
• Protein: 3 g
• Fat: 16 g

Tips and Tricks

• Smooth the Puree: Ensure your sweet potatoes are mashed completely smooth. Lumps of potato will create strange textures in your soft cake crumb.
• Don’t Overbake: Because this cake is so dense and moist, start checking it with a toothpick at the 30-minute mark. Overbaking will dry out the edges.
• Glaze While Warm: Do not wait for the cake to cool completely! Pouring the icing over the cake while it is still warm allows the glaze to seep into the cracks and crevices, creating a sticky, honey bun-like surface.