This decadent, moist chocolate Texas sheet cake (often called “Texas brownies”) is ideal for potlucks, picnics, and family gatherings. A smooth, fudgy frosting is poured over the cake while it’s still warm, creating a quick, impressive dessert that slices easily for sharing.
Origins of this Classic Texas Sheet Cake
Texas sheet cake is a single-layer chocolate cake known for its tender, moist crumb and thin, fudgy icing poured directly on the warm cake. The recipe’s exact origin is unclear. Some attribute the name to early newspaper publications in Texas, while others say it refers to the cake’s large, sheet-pan size—big enough that people joked it was “as big as Texas.” Regardless of its origin, this chocolate sheet cake has become a potluck favorite across the country.
Its simplicity, portability, and rich flavor make it a dependable dessert to bring to celebrations or to enjoy at home. The technique of pouring warm frosting onto the just-baked cake creates that classic glossy, slightly-set topping everyone loves.
Ingredients for Chocolate Texas Sheet Cake
For the cake:
- 2 cups all-purpose flour
- 2 cups granulated sugar
- 1 cup (2 sticks) butter
- 1 cup strong brewed coffee or hot water
- 1/4 cup unsweetened cocoa powder
- 1/2 cup buttermilk (If you don’t have buttermilk: add 1/2 tablespoon lemon juice to a measuring cup and fill with milk to 1/2 cup; let sit 5 minutes.)
- 2 large eggs
- 1 teaspoon baking soda
- 1 teaspoon vanilla extract
For the fudgy frosting:
- 1/2 cup (1 stick) butter
- 2 tablespoons unsweetened cocoa powder
- 1/4 cup milk
- 3 1/2 cups powdered (confectioners’) sugar
- 1 teaspoon vanilla extract
Step-by-Step Instructions
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Prepare dry ingredients and preheat: In a large mixing bowl combine the flour and sugar. Preheat the oven to 400°F (205°C). Lightly spray or grease a 17½ x 11-inch jelly roll pan (or a comparable rimmed baking sheet).
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Make the hot chocolate mixture: In a small saucepan, combine the butter, cocoa, and brewed coffee or hot water. Heat and stir until the butter melts and the mixture reaches a gentle boil.
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Combine and mix the batter: Immediately pour the boiling liquid over the flour and sugar. Add the buttermilk, eggs, baking soda, and vanilla. Mix thoroughly with a wooden spoon or an electric mixer until smooth and fully combined.
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Bake: Pour the batter into the prepared pan and spread evenly. Bake for about 20 minutes at 400°F (205°C), or until a toothpick inserted in the center comes out with a few moist crumbs but is not wet. Remove from oven.
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Prepare the frosting while cake bakes: In a saucepan combine the butter, cocoa, and milk. Heat to a boil, stirring constantly. Remove from heat and gradually whisk in the powdered sugar until smooth, then stir in the vanilla. For the silkiest texture, use an electric mixer to finish the frosting.
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Frost while warm: This step is essential: as soon as the cake comes out of the oven, pour the warm frosting evenly over the surface and quickly spread it to the edges. The warm cake helps the frosting set to a glossy, slightly firm finish. If desired, add sprinkles or chopped nuts before the frosting fully sets.
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Cool and serve: Allow the cake to cool on a wire rack until the frosting is set. Cut into 32 bars for easy serving. Store leftovers covered at room temperature for a day or two, or refrigerate for longer storage.
This Texas sheet cake is an excellent make-and-take dessert: it travels well, feeds a crowd, and delivers a classic chocolate flavor with minimal fuss.
Other Desserts Perfect for Picnics & Potlucks
- Grandma’s Strawberry Pie with Jell-O — a classic summer favorite.
- Rhubarb Crisp with an oatmeal topping — tangy and comforting.
- Peanut Butter Chocolate Chip Cookies — two beloved flavors in one cookie.
- Banana Cream Pie — layers of sliced bananas with homemade pudding.
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Texas Brownies
Prep Time: 15 minutes ·
Cook Time: 20 minutes ·
Total Time: 35 minutes
Decadent, moist, and topped with a glossy, fudgy frosting poured while warm—this Texas sheet cake is one of the best chocolate desserts to share at gatherings.
Ingredients
- (For the sheet cake) 2 cups all-purpose flour
- 2 cups sugar
- 1 cup butter
- 1 cup strong brewed coffee or hot water
- 1/4 cup unsweetened cocoa powder
- 1/2 cup buttermilk (or 1/2 tbsp lemon juice plus milk to fill 1/2 cup)
- 2 eggs
- 1 teaspoon baking soda
- 1 teaspoon vanilla
- (For the frosting) 1/2 cup butter, 2 tbsp cocoa, 1/4 cup milk, 3 1/2 cups powdered sugar, 1 tsp vanilla
Instructions (Summary)
- Preheat oven to 400°F. Combine flour and sugar in a large bowl.
- Boil butter, coffee (or water), and cocoa; pour over dry ingredients. Add buttermilk, eggs, baking soda, and vanilla. Mix until smooth.
- Pour batter into a prepared 17½ x 11-inch pan and bake 20 minutes or until set.
- While baking, make frosting: boil butter, cocoa, and milk; stir in powdered sugar and vanilla until smooth.
- Pour warm frosting over the hot cake and spread quickly. Cool, then cut into bars.
Notes
If you don’t have buttermilk, stir 1/2 tablespoon lemon juice into milk and let stand for a few minutes to thicken as a substitute.
Nutrition Information (per serving)
Yield: 32 · Calories: 212 · Total Fat: 9g · Saturated Fat: 6g · Trans Fat: 0g · Unsaturated Fat: 3g · Cholesterol: 35mg · Sodium: 121mg · Carbohydrates: 31g · Fiber: 0g · Sugar: 25g · Protein: 2g
