Grandma's Texas Sheet Cake Recipe, Made from Scratch

Texas sheet cake is a thin, tender chocolate cake baked in a large pan and covered with warm chocolate-pecan frosting. This homestyle version uses cocoa and buttermilk for a soft crumb, with the frosting poured over the cake while it is still warm so it settles into a glossy, easy-to-slice top.

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
1/2 teaspoon fine salt
1 cup (227 g) unsalted butter, divided
1 cup (240 ml) water
1/3 cup (30 g) unsweetened natural cocoa powder, divided
2 large eggs (about 100 g without shells), at room temperature
1/2 cup (120 ml) buttermilk, at room temperature
1 teaspoon vanilla extract, divided
3 cups (360 g) powdered sugar, sifted if lumpy
1/2 cup (120 ml) whole milk
1 cup (115 g) chopped pecans

Instructions

Heat the oven to 350°F (175°C). Grease a 13-by-18-inch rimmed sheet pan (about 33-by-46 cm); a light coating of butter or baking spray helps the cake release. Set the pan on a level baking sheet if it is thin or prone to flexing. Measure all ingredients before starting, and leave the eggs and buttermilk out briefly so they are not refrigerator-cold.
Whisk the flour, sugar, baking soda, and salt together in a large bowl. In a saucepan over medium heat, combine 1/2 cup (113 g) of the butter, the water, and 1/4 cup (22 g) of the cocoa powder. Bring just to a boil, stirring so the butter melts and the cocoa disperses. Remove from the heat as soon as it boils; prolonged boiling reduces the liquid and can make the cake dry.
Pour the hot cocoa mixture over the flour mixture and whisk until no dry streaks remain. In a small bowl, beat the eggs lightly, then whisk in the buttermilk and 1/2 teaspoon vanilla. Stir this into the batter just until smooth. Scrape the bowl once, but do not beat for several minutes: overmixing after adding flour can produce a tougher crumb.
Pour the batter into the prepared pan and spread it into the corners. Bake for 18–22 minutes, beginning to check at 18 minutes. The center should spring back lightly when touched, and a toothpick inserted in the middle should come out with a few moist crumbs but no wet batter. Avoid waiting for a completely dry toothpick, which can mean the thin cake has overbaked.
While the cake bakes, make the frosting. In a saucepan, combine the remaining 1/2 cup (113 g) butter, 1/4 cup (22 g) cocoa powder, and the milk. Heat over medium, stirring, until the butter melts and the mixture is steaming; do not let it boil hard. Remove from the heat. Whisk in the remaining 1/2 teaspoon vanilla and the powdered sugar, a cup at a time, until smooth, then fold in the pecans. If the frosting thickens before the cake is ready, gently warm it and stir; add milk 1 teaspoon at a time only if needed.
Set the pan on a heatproof surface as soon as the cake comes out. Pour the warm frosting evenly over the hot cake, nudging it to the edges with an offset spatula or the back of a spoon. Let the cake cool in the pan until the frosting is set enough to cut, about 30–45 minutes. The frosting will remain soft rather than becoming a firm shell. Cut into 20 squares, wiping the knife between cuts for neater edges.

Tips

Use the right pan. A 13-by-18-inch rimmed pan gives the cake its characteristic thin layers and lets the frosting spread evenly. A 10-by-15-inch jelly-roll pan makes a thicker cake, so it may need a few extra minutes; check the center rather than relying only on the clock.
Make buttermilk if needed. For this small quantity, stir 1 1/2 teaspoons lemon juice or white vinegar into 1/2 cup (120 ml) milk and wait 5 minutes. It provides acidity, though the flavor and thickness are a little less rich than cultured buttermilk.
Keep the cake tender. Measure flour by spooning it into the cup and leveling, or weigh it. Packing flour into a cup can add too much and make the crumb dry. Mix only until the batter is smooth.
Frost while hot. Pouring the frosting over the cake straight from the oven is part of the classic texture. If either the cake or frosting cools too much first, the frosting can drag rather than spread smoothly.

Serving Suggestions

Serve squares at room temperature, when the chocolate flavor is clear and the frosting is soft. A small scoop of vanilla ice cream or a spoonful of lightly sweetened whipped cream makes a simple dessert; fresh strawberries or raspberries add a bright contrast. For a gathering, cut modest squares because this cake is rich, and offer coffee, tea, or cold milk alongside it.

Variations

For a nut-free cake, leave out the pecans; the frosting will still spread and set, though it will have less crunch. Walnuts can replace pecans in the same quantity, with a slightly more robust flavor. For a deeper chocolate taste, use Dutch-process cocoa only if you also replace the baking soda with 1 teaspoon baking powder and expect a slightly different rise; natural cocoa is the reliable choice for the recipe as written.

You can also add 1/2 teaspoon ground cinnamon to the dry ingredients for a gentle warm note, or stir 1 teaspoon instant espresso powder into the hot water to accent the cocoa without making the cake taste strongly of coffee. Keep add-ins modest so the thin cake bakes evenly.

Storage and Reheating

Because the frosting contains milk, refrigerate leftover cake within 2 hours of baking or serving. Cover the pan or transfer slices to an airtight container; the cake keeps for 3–4 days in the refrigerator. Let slices sit at room temperature for about 20–30 minutes before serving for a softer texture. To warm an individual piece, microwave it in short 8–10-second bursts just until slightly warm; overheating can make the frosting run.

For longer storage, freeze individual slices in a single layer until firm, then wrap well and keep in a freezer-safe container for up to 2 months for best quality. Thaw overnight in the refrigerator, then bring to room temperature. Avoid freezing an uncovered pan, as the frosting can pick up freezer odors and the cake can dry out.

Frequently Asked Questions

Why is it called Texas sheet cake?
The name refers to a large, thin cake baked in a sheet pan and is associated with Texas-style home baking. Family and regional versions differ in pan size, cocoa level, and whether they include nuts, so this is one classic-style approach rather than a single definitive formula.

Can I make Texas sheet cake without buttermilk?
Yes. Use the quick milk-and-lemon-juice or vinegar substitute in the Tips section. The acidity helps the baking soda work, and the cake will still be tender, though cultured buttermilk gives a fuller tang.

Can I bake it in a smaller pan?
A smaller pan makes a thicker cake and may overflow if filled too high. A 10-by-15-inch pan is a practical alternative, but check doneness after 20 minutes and allow extra baking time as needed. Do not fill a pan more than about two-thirds full; bake any excess batter separately.

How do I know when the cake is done?
Check the center with a toothpick and look for a few moist crumbs, not liquid batter. The center should also spring back gently. Since pan material and oven calibration affect timing, start checking at 18 minutes rather than waiting for the maximum time automatically.

Can I make the cake ahead?
Yes. Bake and frost it the day before, let the frosting set, then cover and refrigerate. Bring it toward room temperature before serving. For the neatest slices, cut it while cool, then let the pieces soften slightly before serving.

Why did my frosting turn grainy or too thick?
Powdered sugar can clump if it is not sifted, and frosting thickens as it cools. Whisk thoroughly and warm it gently if needed. If it is still too thick to pour, add milk a teaspoon at a time; avoid adding a large splash, which can make it runny.

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Grandma’s Texas Sheet Cake Recipe, Made from Scratch