Sweet Potato Sheet Cake – Moist Spiced Autumn Bakery Dessert

Imagine sliding your dessert fork into an ultra-tender, spiced autumn cake infused with roasted sweet potatoes, warm cinnamon, fragrant nutmeg, and rich brown sugar, all blanketed beneath a thick, velvety layer of tangy cream cheese frosting. This bakery-style Sweet Potato Sheet Cake delivers the ultimate harvest comfort and decadent richness in every single melt-in-your-mouth bite. If you are searching for a fast, crowd-pleasing dessert that feeds a whole party and stays unbelievably moist without tricky multi-layer stacking or complicated kitchen steps, you have found the dream recipe. Let’s head straight down to see how quickly this sweet sheet cake comes together today!

Why You’ll Love This Recipe

• Incomparably Moist Spiced Crumb: Real mashed sweet potatoes, sour cream, melted butter, and eggs create an extraordinarily tender bakery crumb.
• Warm Autumn Spice Blend: Aromatic cinnamon, ground ginger, and fragrant nutmeg infuse cozy harvest depth throughout the batter.
• Silky Tangy Cream Cheese Frosting: Real brick cream cheese whipped with butter, powdered sugar, and vanilla spreads like a luscious dream.
• Effortless One-Pan Sheet Cake: Bakes in a single 9×13-inch pan, eliminating the stress of leveling, layering, or complicated cake decorating.
• Perfect for Holiday Gatherings: Slices effortlessly into generous squares for Thanksgiving dessert tables, fall potlucks, and cozy family celebrations.

Ingredients

For the cake:

• Cooking spray
• 2 cups all-purpose flour
• 2 teaspoons ground cinnamon
• 1 1/2 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon ground ginger
• 1/2 teaspoon ground nutmeg
• 1 cup melted unsalted butter or vegetable oil
• 1 cup granulated sugar
• 1 cup packed dark or light brown sugar
• 1/2 teaspoon kosher salt
• 4 large eggs
• 2 cups mashed, cooked sweet potatoes (from about 2 medium baked sweet potatoes)
• 1/4 cup sour cream
• 2 teaspoons vanilla extract

For the frosting:

• 8 ounces full-fat cream cheese, at room temperature
• 4 tablespoons (1/2 stick) unsalted butter, at room temperature
• 1/2 teaspoon kosher salt
• 3 cups powdered sugar
• 1 teaspoon vanilla extract

How To Make Sweet Potato Sheet Cake Step by Step

1. Prep Oven and Whisk Dry Mix

Preheat your baking oven to 350°F (175°C), coat a 9×13-inch metal baking pan with cooking spray, and in a large mixing bowl, whisk 2 cups all-purpose flour, 2 teaspoons ground cinnamon, 1 1/2 teaspoons baking powder, 1 teaspoon baking soda, 1/2 teaspoon ground ginger, 1/2 teaspoon ground nutmeg, and 1/2 teaspoon kosher salt until evenly blended.

2. Whisk Wet Ingredients and Sweet Potatoes

In a separate large bowl, whisk 1 cup melted unsalted butter or vegetable oil, 1 cup granulated sugar, 1 cup packed dark or light brown sugar, 4 large eggs, 2 cups mashed, cooked sweet potatoes (from about 2 medium baked sweet potatoes), 1/4 cup sour cream, and 2 teaspoons vanilla extract for 2 minutes until glossy and smooth.

3. Combine Batter and Pour into Pan

Gently fold dry flour mixture into wet sweet potato mixture with a rubber spatula just until combined without overmixing, then spread the thick batter evenly into the prepared 9×13-inch pan.

4. Bake and Cool Cake

Bake at 350°F for 30 to 35 minutes until a toothpick inserted into the center comes out clean and the cake springs back lightly to the touch; let cool completely in the pan on a wire cooling rack.

5. Beat Cream Cheese Frosting

In a medium mixing bowl, beat 8 ounces full-fat cream cheese, at room temperature and 4 tablespoons (1/2 stick) unsalted butter, at room temperature for 2 minutes until light and creamy, then beat in 3 cups powdered sugar, 1 teaspoon vanilla extract, and 1/2 teaspoon kosher salt until silky and fluffy.

6. Frost, Slice, and Serve

Spread the frosting generously over the fully cooled sheet cake with an offset spatula, chill for 20 minutes to set the frosting, and slice into neat bakery squares to serve.

Tips For The Best Sweet Potato Sheet Cake

• Roast and Mash Fresh Sweet Potatoes: Roasting sweet potatoes in their skins caramelizes natural sugars and yields a dense, flavorful puree with less excess water than boiling.
• Use Room-Temperature Cream Cheese & Butter: Bringing frosting dairy to room temperature ensures your cream cheese frosting whips up velvety smooth and free of lumps.
• Do Not Overmix the Flour: Fold the dry ingredients into the wet mixture gently just until no dry flour streaks remain so the cake stays tender and pillowy.
• Cool Cake Completely Before Frosting: Make sure the cake reaches full room temperature before spreading frosting so the rich butter and cream cheese do not melt.
• Spoon and Level the Flour: Fluff your all-purpose flour with a spoon and level off your measuring cup with a flat knife to avoid adding excess flour.

Variations

• Ultra-Moist Sweet Potato Poke Cake Method: Poke holes into the warm cake and pour sweet caramel over top before frosting for a luscious Sweet Potato Poke Cake.
• Festive Sweet Potato Cake With Marshmallow Buttercream Style: Top your spiced sheet bake with toasted marshmallow fluff inspired by a Sweet Potato Cake With Marshmallow Buttercream.
• Bakery Elegant Sweet Potato Cake With Meringue Frosting Idea: Crown the spiced sweet potato sponge with torched peaks reminiscent of a Sweet Potato Cake With Meringue Frosting.

Storage Instructions

• Fridge: Keep leftover frosted sheet cake stored inside an airtight container or tightly covered with foil in the refrigerator for up to 5 days.
• Freezer: Freeze unfrosted baked cake or individual frosted slices wrapped tightly in plastic wrap and aluminum foil for up to 3 months; thaw overnight in the fridge.
• Reheat: Serve chilled directly from the refrigerator, or let cake slices rest on the counter for 15 minutes before serving to soften the rich crumb.

Serving and Pairing Ideas

• Serve thick cake slices topped with an extra dusting of ground cinnamon, chopped toasted pecans, or a scoop of rich vanilla bean ice cream.
• Pair your sweet afternoon dessert with a hot mug of decaf black coffee, a warm espresso, or herbal chamomile tea.
• Serve alongside a cold glass of whole dairy milk, creamy oat milk, or a steaming mug of spiced apple cider.

Frequently Asked Questions

Can I use canned sweet potato puree instead of fresh sweet potatoes?

Yes, absolutely! You can use 2 cups of 100% pure canned sweet potato puree. Make sure not to use canned sweet potatoes packed in heavy syrup, as the added sugar will alter the sweetness and moisture balance of the cake.

Why is sour cream used in this sheet cake?

Sour cream adds rich dairy fat and natural acidity. The acidity softens the flour gluten, producing an exceptionally tender, velvety crumb that stays moist for days without making the cake feel dense or oily.

How do I know when the sweet potato cake is done baking?

Insert a wooden toothpick into the center of the cake around the 30-minute mark. The cake is done when the toothpick comes out clean or with a few moist crumbs attached, and the edges pull away slightly from the pan.

Can I make this cake a day in advance?

Yes! This sheet cake tastes even better the next day as the sweet potato, brown sugar, vanilla, and warm spices deepen in flavor. Bake and frost the cake, cover it tightly, and keep it chilled in the refrigerator until party time.

Ready to Make It?

There is truly nothing quite like slicing into a fresh, homemade sweet potato sheet cake topped with a generous swirl of silky cream cheese frosting. This simple recipe transforms classic kitchen pantry staples—flour, warm spices, butter, sugars, eggs, fresh sweet potatoes, sour cream, vanilla, cream cheese, and powdered sugar—into an unforgettable bakery masterpiece that your whole family will love sharing. We hope you have an absolutely wonderful time making this sweet autumn dessert in your kitchen this week! Go ahead and save this recipe to your favorite Thanksgiving baking, holiday dessert, and easy cake boards on Pinterest so it is always ready for your next cozy gathering.

More Easy Dessert Recipes You’ll Love

• Peach Sorbet – Sweet Summer Frozen Dessert.
• Pineapple Coconut Smoothie – Tropical Refreshment.
• Homemade Peach Ice Cream – Creamy Fruit Dessert.
• Strawberry Ice Cream – Classic Frozen Treat.

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