Pumpkin Sheet Cake with Brown Butter Frosting

This pumpkin sheet cake with brown butter frosting is a tender, warmly spiced dessert made for sharing. The cake bakes in one rectangular pan, so every piece has a soft crumb and plenty of frosting. Browned butter gives the topping a nutty, caramel-like flavor that makes ordinary pumpkin cake feel special. Serve it at a fall gathering, pack it into lunch boxes, or enjoy a square with coffee on a quiet afternoon.

Why You’ll Love This Pumpkin Sheet Cake

• Easy pan preparation: One 9-by-13-inch pan means no stacking or complicated decorating.
• Moist pumpkin crumb: Pumpkin puree and oil keep the cake tender without making it greasy.
• Deep frosting flavor: Brown butter adds toasted richness to the simple powdered sugar topping.
• Great for a crowd: The sheet cake cuts into generous squares and travels well.
• Flexible finish: Add pecans, a maple drizzle, or leave the surface smooth and simple.

Ingredients

For the cake

• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1 teaspoon pumpkin pie spice
• 1/2 teaspoon ground cinnamon
• 1/2 teaspoon fine salt
• 1 cup granulated sugar
• 1/2 cup packed light brown sugar
• 1 cup pure pumpkin puree
• 3 large eggs
• 1/2 cup neutral oil
• 1 teaspoon vanilla extract
• 1/2 cup buttermilk

For the brown butter frosting

• 1/2 cup unsalted butter
• 3 cups powdered sugar
• 1/3 cup heavy cream or milk
• 1 teaspoon vanilla extract
• 1/4 teaspoon cinnamon
• Pinch of salt

Optional toppings

• 1/2 cup toasted chopped pecans
• 1 tablespoon maple syrup, for drizzling
• Ground cinnamon, for dusting

How to Make Pumpkin Sheet Cake with Brown Butter Frosting

1. Prepare the pan. Heat the oven to 350°F. Grease a 9-by-13-inch baking pan and line it with parchment, leaving a little overhang on two sides.
2. Mix the dry ingredients. Whisk the flour, baking powder, baking soda, pumpkin pie spice, cinnamon, and salt in a medium bowl.
3. Mix the wet ingredients. In a large bowl, whisk the sugar, brown sugar, pumpkin puree, eggs, oil, vanilla, and buttermilk until smooth.
4. Combine the batter. Add the dry ingredients to the pumpkin mixture and fold just until no flour streaks remain. Do not overmix.
5. Bake the cake. Spread the batter evenly in the prepared pan. Bake for 25 to 30 minutes, until the center springs back and a toothpick comes out with a few moist crumbs.
6. Cool completely. Let the cake cool in the pan for 20 minutes, then lift it onto a rack or leave it in the pan. The frosting needs a fully cool surface.
7. Brown the butter. Melt the butter in a saucepan over medium heat. Cook for 4 to 6 minutes, swirling frequently, until golden flecks form and the butter smells nutty. Pour it into a bowl and cool for 10 minutes.
8. Make the frosting. Beat the browned butter, powdered sugar, cream, vanilla, cinnamon, and salt until smooth and fluffy. Add another teaspoon of cream if it is too thick.
9. Frost the cake. Spread the frosting over the cooled cake. Sprinkle with pecans or cinnamon and drizzle lightly with maple syrup if desired.
10. Slice and serve. Let the frosting set for 15 minutes, then cut the cake into squares with a sharp knife.

Tips and Variations

• Use pure pumpkin: Pumpkin pie filling already contains sugar and spices, which can throw off the cake.
• Brown butter carefully: The milk solids can burn quickly after they turn golden. Remove the pan from the heat promptly.
• Make it nut-free: Leave off the pecans and use extra cinnamon or pumpkin seeds for decoration.
• Add chocolate: Fold 1 cup mini chocolate chips into the batter for a pumpkin-chocolate combination.
• Try maple frosting: Replace 2 tablespoons of the cream with maple syrup and add a pinch of salt.
• Use a different pan: A jelly-roll pan makes thinner bars and reduces the baking time to about 18 to 22 minutes.
• Add cream cheese: Beat 4 ounces softened cream cheese into the cooled brown butter before adding the powdered sugar.
• Make cupcakes: Divide the batter among lined cups and bake for 18 to 22 minutes.

For a round cake option, try this pumpkin spice Bundt cake. A lighter party dessert is found in these carrot cake whoopie pies, while cinnamon buttercream frosting offers another cozy topping idea.

Storage and Freezing

Cover the frosted cake and store it at room temperature for up to 2 days, or refrigerate it for up to 4 days. Let chilled squares stand at room temperature for 20 minutes before serving so the frosting softens. Individual pieces can be frozen for up to 2 months; wrap them well and thaw overnight in the refrigerator.

For the neatest make-ahead plan, bake the cake one day ahead and frost it after it cools. Do not frost a warm cake because the browned butter topping will slide. Since the recipe contains eggs and dairy, the USDA’s egg safety guidance is useful when sharing it at a party.

Frequently Asked Questions

How do I make pumpkin sheet cake with brown butter frosting?

Mix a simple pumpkin buttermilk batter, bake it in a 9-by-13-inch pan, cool it completely, and spread it with frosting made from browned butter, powdered sugar, cream, and cinnamon.

Can I use melted butter instead of oil?

Yes, but oil keeps the pumpkin cake especially moist. If using melted butter, cool it before adding it to the eggs and expect a slightly firmer crumb.

Why is my brown butter frosting runny?

The browned butter may have been too warm, or too much cream was added. Let the butter cool until barely warm, then add more powdered sugar a few tablespoons at a time.

Can I make this cake ahead?

Yes. Bake it up to 2 days ahead and keep it covered. Frost it the day before serving, or freeze the unfrosted cake and decorate after thawing.

What can I serve with pumpkin sheet cake?

Serve it with coffee, chai, vanilla ice cream, whipped cream, or a spoonful of apple compote. The nutty frosting also pairs well with toasted pecans.

Serving Ideas

Cut the cake into small squares for a dessert buffet or larger pieces for a family-style meal. Add a few toasted pecans to each slice and keep the maple drizzle light so the browned butter remains the main flavor. For a school or office gathering, leave the cake in the pan and bring a small spatula so it stays protected during transport.

Getting the Frosting Just Right

Brown butter frosting is easiest when the butter is warm but not hot. After browning, let it cool until it feels barely warm to the touch, then beat it with the powdered sugar. If the mixture looks loose, add sugar gradually. If it looks stiff, add cream one teaspoon at a time. For a smoother finish, sift the powdered sugar before mixing. You can frost the cake in the pan for a casual look, or lift it out using the parchment overhang and frost the top on a board. Chilling the frosted cake for 20 minutes makes clean cuts easier and helps the topping stay in place.

A Simple Holiday Finish

Sprinkle the surface with chopped pecans and a little cinnamon just before serving. Small maple leaves cut from extra pie crust make a charming decoration if you are already using the oven, while a few orange curls add bright color to the brown and gold cake.