Chocolate Texas sheet cake is a thin, tender cake baked in a large pan and topped with warm cocoa icing that spreads into a soft, glossy layer. This familiar Southern-style dessert gets its moist crumb from a simple butter-and-cocoa batter, and the icing is poured over while the cake is still warm for an easy finish.
Ingredients
- 2 cups (250 g) all-purpose flour, spooned into the measuring cup and leveled
- 2 cups (400 g) granulated sugar
- 1 teaspoon baking soda
- ½ teaspoon fine salt
- 1 cup (227 g) unsalted butter, cut into pieces
- ¼ cup (21 g) unsweetened natural cocoa powder
- 1 cup (240 ml) water
- 2 large eggs, at room temperature
- ½ cup (120 ml) buttermilk, at room temperature
- 1 teaspoon vanilla extract
- For the icing: ½ cup (113 g) unsalted butter
- ¼ cup (21 g) unsweetened natural cocoa powder
- 6 tablespoons (90 ml) milk
- 3½ cups (420 g) powdered sugar, sifted if lumpy
- 1 teaspoon vanilla extract
- ½ cup (60 g) chopped pecans, optional
Instructions
- Heat the oven to 350°F (175°C). Grease a 13-by-18-inch rimmed half-sheet pan, about 1 inch deep. If you have only a 10-by-15-inch jelly-roll pan, it can work, but the cake will be thicker and may need several extra minutes; begin checking it at 22 minutes. Avoid a flat, unrimmed baking sheet.
- In a large bowl, whisk together the flour, sugar, baking soda, and salt. Set it near the stove. In a small bowl or measuring jug, whisk the eggs, buttermilk, and 1 teaspoon vanilla until combined.
- Put the cake butter, cocoa, and water in a medium saucepan. Heat over medium, stirring, until the butter melts and the mixture just reaches a gentle simmer. Take it off the heat; do not let it boil hard. Pour it over the dry ingredients and stir until no dry flour remains. The batter will be thin. Let it cool for about 3 minutes, then gradually stir in the egg mixture until smooth. Cooling briefly helps keep the eggs from scrambling on contact.
- Pour the batter into the prepared pan and spread it evenly into the corners. Bake for 18–22 minutes, rotating the pan once if your oven browns unevenly. The cake is ready when the center springs back lightly and a wooden pick inserted near the middle comes out with a few moist crumbs but no wet batter. Don’t wait for the pick to come out completely dry, which can mean the cake is overbaked.
- While the cake bakes, make the icing. In a saucepan over medium heat, melt the icing butter with the cocoa and milk, stirring until smooth and steaming. Remove it from the heat. Whisk in the powdered sugar a cup at a time, then stir in the vanilla and pecans, if using. The icing should be pourable; if it seems too thick, add milk 1 teaspoon at a time.
- Take the cake from the oven and immediately pour the warm icing evenly over the warm surface. Tilt the pan carefully to help it reach the edges, or spread it gently with an offset spatula. Leave the cake in the pan until the icing sets, about 20 minutes, then cut into squares. The cake can be served slightly warm or at room temperature.
Tips
- Measure flour by spooning it into the cup and leveling the top, or weigh it. Scooping directly from the bag can pack in extra flour and make the cake heavy.
- Buttermilk gives the crumb a light tang and reacts with the baking soda. If you don’t have it, stir 1½ teaspoons (7 ml) lemon juice or white vinegar into ½ cup (120 ml) milk and let it stand for 5 minutes. The substitute works well, though the flavor is a little less rich.
- Use natural, unsweetened cocoa rather than sweetened drinking chocolate. Dutch-process cocoa can work, but the cake’s flavor and rise may differ slightly because it is less acidic.
- Pour icing over the cake while both are warm. If the cake cools fully first, the icing will not spread as readily and may sit on top instead of forming the characteristic soft layer.
Serving Suggestions
Cut the cake into modest squares because the icing is sweet and rich. Serve it plain, or add a scoop of vanilla ice cream or a spoonful of lightly whipped cream. Fresh strawberries or raspberries add a tart contrast, while coffee or cold milk makes a simple accompaniment. For neat slices, wipe the knife between cuts and wait until the icing has set.
Variations
For a classic nut-free cake, leave out the pecans; no other change is needed. To bring out the chocolate flavor, add 1 teaspoon (5 ml) instant espresso powder to the cocoa mixture—this adds depth without making the cake taste strongly of coffee. You can also add ½ cup (85 g) semisweet chocolate chips to the batter, though the crumb will be slightly richer and less traditional.
For a buttermilk-free version, use the milk-and-lemon-juice substitute in the tips. A dairy-free adaptation is possible with plant-based butter and unsweetened plant milk, but the texture and icing set can vary by product. Use a baking-compatible butter alternative rather than a soft tub spread, which contains more water.
Storage and Reheating
Because the cake contains eggs and dairy, refrigerate leftovers within 2 hours of baking or serving. Cover the pan tightly or move pieces to an airtight container; refrigerate for up to 3–4 days. The icing firms when chilled. Let a piece sit at room temperature for 20–30 minutes, or microwave an individual slice for about 8–12 seconds, just until softened. Avoid overheating, which can make the icing greasy.
To freeze, chill the cake until the icing is firm, cut it into squares, and wrap portions well in plastic wrap and foil or place them in a freezer-safe container. Freeze for up to 2 months for best quality. Thaw covered in the refrigerator overnight, then bring to room temperature before serving. If reheating leftovers until hot throughout, the USDA FSIS safe minimum for reheated leftovers is 165°F (74°C); for this cake, gentle warming of a single slice is usually preferable to heating the whole pan.
Frequently Asked Questions
Why is it called Texas sheet cake?
The name refers to its large, thin sheet-pan shape and its association with Texas-style home baking. Family versions vary in pan size, nuts, and icing, so there is no single fixed formula.
Can I bake it in a 9-by-13-inch pan?
A 9-by-13-inch pan is smaller and deeper than the sheet pan specified here, so this full recipe may overflow. For that size, make a half batch, or use a larger rimmed pan. If you do use a smaller pan with a reduced batch, start checking the center at about 22 minutes.
Can I make the cake ahead?
Yes. Bake and ice it the day before, let the icing set, then cover and refrigerate. Bring it toward room temperature before serving. For the freshest texture, avoid leaving it uncovered in the refrigerator, where the cake can dry out.
How do I know when the cake is done?
Look for a center that springs back lightly when touched and a wooden pick with moist crumbs but no liquid batter. Since sheet cakes bake quickly, begin checking at 18 minutes, especially if your oven runs hot.
Why did my icing turn grainy?
Powdered sugar that is lumpy or added too quickly can leave small clumps. Sift it if needed and whisk it into the warm butter mixture gradually. If the icing becomes too thick while you work, stir in a little milk; don’t boil it to thin it.
Can I leave out the pecans?
Absolutely. The nuts are optional and are often included in some family versions, but the cake and icing work well without them. If serving guests, mention pecans when included because they are a tree nut.
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