Texas sheet cake is a beloved American dessert known for its rich chocolate flavor, tender crumb, and signature fudge frosting poured over the warm cake. The pan you use matters: a classic 18×13-inch half-sheet pan yields the traditional thin cake, while a 9×13-inch pan works for a thicker version. This article covers everything you need to know about Texas sheet cake pans, including sizes, substitutions, and a foolproof recipe that works in both.
Ingredients
- 2 cups (250 g) all-purpose flour
- 2 cups (400 g) granulated sugar
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1 cup (2 sticks, 226 g) unsalted butter
- 1 cup (240 ml) water
- 1/4 cup (25 g) unsweetened cocoa powder (natural or Dutch-process)
- 1/2 cup (120 ml) buttermilk, at room temperature
- 2 large eggs, at room temperature
- 1 teaspoon vanilla extract
- For the frosting:
- 1/2 cup (1 stick, 113 g) unsalted butter
- 1/4 cup (25 g) unsweetened cocoa powder
- 1/4 cup (60 ml) milk (any kind)
- 3 cups (360 g) powdered sugar, sifted
- 1 teaspoon vanilla extract
- 1 cup (120 g) chopped pecans or walnuts (optional)
Instructions
- Preheat your oven to 350°F (175°C). Grease a 18×13-inch half-sheet pan (about 1 inch deep) or a 9×13-inch pan. For easy removal, line the bottom with parchment paper.
- In a large bowl, whisk together the flour, sugar, baking soda, and salt. Set aside.
- In a medium saucepan, melt the butter over medium heat. Add the water and cocoa powder, and whisk until smooth. Bring the mixture to a gentle boil, then remove from heat immediately.
- Pour the hot chocolate mixture over the dry ingredients and stir until just combined. The batter will be thin.
- In a small bowl, beat the buttermilk, eggs, and vanilla together. Add to the batter and mix until fully incorporated, about 1 minute.
- Pour the batter into the prepared pan. For an 18×13-inch pan, bake for 20–25 minutes. For a 9×13-inch pan, bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean. The cake should pull away slightly from the edges.
- While the cake bakes, make the frosting. In a saucepan, melt the butter over medium heat. Stir in the cocoa powder and milk. Bring to a simmer, then remove from heat.
- Whisk in the powdered sugar and vanilla until smooth. If the frosting is too thick, add a tablespoon of milk at a time until spreadable.
- When the cake is done, remove it from the oven and place it on a wire rack. Pour the warm frosting over the hot cake (within 5 minutes of baking) and spread evenly. Sprinkle with nuts if using.
- Let the cake cool completely before slicing—about 45 minutes. The frosting will set as it cools.
Tips
- Pan size matters: The classic Texas sheet cake uses an 18×13-inch half-sheet pan (also called a jelly-roll pan). If you only have a 9×13-inch pan, the cake will be thicker and need extra baking time—check at 30 minutes.
- Don’t overmix: Overmixing the batter after adding the eggs can develop gluten and make the cake tough. Mix just until no streaks remain.
- Pour frosting on a warm cake: The frosting must be poured over the cake while both are warm—this lets the frosting soak slightly into the top and creates that classic fudgy layer. If the cake cools completely, the frosting won’t spread as smoothly.
- Substitutions: Buttermilk can be replaced with 1/2 cup (120 ml) milk mixed with 1/2 tablespoon lemon juice or vinegar, left to sit for 5 minutes. For a dairy-free version, use plant-based butter and milk, but note the texture may be slightly different.
Serving Suggestions
Texas sheet cake is typically served as a large, thin square or rectangle, often straight from the pan. It’s perfect for potlucks, birthdays, or any gathering where you need to feed a crowd. Serve it with a scoop of vanilla ice cream or a dollop of whipped cream to balance the rich chocolate. A glass of cold milk is the classic pairing.
Variations
- Chocolate-Peanut Butter: Stir 1/2 cup (130 g) creamy peanut butter into the frosting before spreading.
- Mocha: Replace the water in the cake with strong brewed coffee for a deeper chocolate flavor.
- Spiced: Add 1 teaspoon of cinnamon and a pinch of cayenne to the dry ingredients for a Mexican-chocolate twist.
- Gluten-Free: Substitute the all-purpose flour with a 1:1 gluten-free baking flour blend. The texture will be slightly more crumbly but still delicious.
Storage and Reheating
Store leftover Texas sheet cake in an airtight container at room temperature for up to 3 days. The frosting will stay soft and fudgy. For longer storage, refrigerate for up to 5 days—bring to room temperature before serving. To freeze, wrap the cake (with or without frosting) tightly in plastic wrap and then foil; freeze for up to 3 months. Thaw overnight in the refrigerator. To reheat individual slices, microwave for 10–15 seconds until just warm, or place in a 300°F (150°C) oven for 5–7 minutes.
Frequently Asked Questions
Can I use a regular 9×13-inch pan instead of a half-sheet pan? Yes, but the cake will be thicker and require longer baking (30–35 minutes). The texture will be slightly more cake-like and less crispy-edged, but it’s still delicious.
Why is my frosting grainy? Grainy frosting usually means the powdered sugar wasn’t sifted or the frosting was overbeaten. Sift the sugar and stir gently until smooth. If it’s already grainy, try adding a tablespoon of milk and stirring until smooth.
Can I make this cake ahead of time? Absolutely. Bake and frost the cake, let it cool completely, then cover and store at room temperature for up to 2 days. The flavors meld and the cake stays moist.
What if I don’t have buttermilk? Use the substitution mentioned in the tips: 1/2 cup (120 ml) milk plus 1/2 tablespoon lemon juice or vinegar, left for 5 minutes.
Can I use Dutch-process cocoa instead of natural? Yes, but the cake may rise slightly less because Dutch-process cocoa is less acidic. If you use Dutch-process, you can add 1/4 teaspoon of baking powder to help with leavening.
Why does the recipe call for pouring frosting on the hot cake? This is a signature of Texas sheet cake—the warm frosting seeps into the top layer, creating a fudgy, slightly gooey crust. If you wait until the cake is cool, the frosting will sit on top and not soak in, changing the texture.
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