Texas sheet cake is a classic American dessert: a rich, fudgy chocolate cake baked in a jelly-roll pan and topped with a pourable chocolate-pecan icing that sets into a glossy shell. What makes it so reliable is the buttermilk in the batter, which keeps the crumb tender even when the cake is baked thin and wide. This recipe gives you the traditional version plus five simple variations—cinnamon, peanut butter, Mexican chocolate, coconut, and mocha—so you can make one batter and change the flavor with minimal extra work.
Ingredients
For the Cake
- 2 cups (250 g) all-purpose flour
- 2 cups (400 g) granulated sugar
- 1 tsp baking soda
- 1/2 tsp 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, room temperature
- 2 large eggs, room temperature
- 1 tsp vanilla extract
For the Classic Chocolate-Pecan Icing
- 1/2 cup (1 stick, 113 g) unsalted butter
- 1/4 cup (25 g) unsweetened cocoa powder
- 1/4 cup (60 ml) whole milk
- 3 1/2 cups (420 g) powdered sugar, sifted
- 1 tsp vanilla extract
- 1 cup (120 g) chopped pecans or walnuts (optional)
Instructions
- Preheat the oven to 350°F (175°C). Grease a 15×10×1-inch (38×25×2.5 cm) jelly-roll pan with butter or nonstick spray.
- In a large bowl, whisk together the flour, sugar, baking soda, and salt. Set aside.
- In a medium saucepan over medium heat, melt the butter. Add the water and cocoa powder, whisking until smooth. Bring just to a simmer, then remove from heat.
- Pour the hot chocolate mixture over the dry ingredients and stir until combined. The batter will be thin.
- In a small bowl, beat the buttermilk, eggs, and vanilla together. Add to the batter and stir until fully incorporated.
- Pour the batter into the prepared pan. Bake for 20–25 minutes, or until a toothpick inserted in the center comes out clean. The cake will be springy to the touch.
- While the cake bakes, make the icing. In a saucepan, melt the butter over medium heat. Whisk in the cocoa powder and milk. Bring to a simmer, then remove from heat.
- Whisk in the powdered sugar and vanilla until smooth. Stir in the pecans if using.
- Pour the warm icing over the cake as soon as it comes out of the oven. Spread evenly with an offset spatula. The icing will set as it cools.
- Cool the cake completely on a wire rack, at least 45 minutes, before slicing.
Tips
- Use room-temperature buttermilk and eggs so they blend into the hot batter without curdling. If you don’t have buttermilk, add 1 1/2 tsp lemon juice or white vinegar to 1/2 cup (120 ml) whole milk and let sit for 5 minutes.
- Don’t overbake. The cake is done when a toothpick comes out with a few moist crumbs, not completely dry. Overbaking makes the thin cake tough.
- Pour the icing over the cake while both are warm. If the cake cools completely, the icing won’t spread as smoothly and may not form that classic shiny top.
- If you prefer a less sweet icing, reduce the powdered sugar to 3 cups (360 g) and add an extra tablespoon of milk.
Serving Suggestions
Serve the cake at room temperature, cut into squares. It’s rich enough to stand alone, but a scoop of vanilla ice cream or a dollop of lightly sweetened whipped cream balances the chocolate. For a Southern-style presentation, add a few extra toasted pecans on top before the icing sets.
Variations
- Cinnamon Texas Sheet Cake: Add 1 tsp ground cinnamon to the dry ingredients in the cake and 1/2 tsp to the icing. This adds warmth without changing the texture.
- Peanut Butter Texas Sheet Cake: Stir 1/2 cup (130 g) creamy peanut butter into the warm icing after removing it from the heat. Omit the pecans or keep them—both work.
- Mexican Chocolate Texas Sheet Cake: Add 1 tsp ground cinnamon and 1/4 tsp cayenne pepper to the dry ingredients. Use dark cocoa powder if you have it. The heat is subtle but noticeable.
- Coconut Texas Sheet Cake: Replace the pecans in the icing with 1 cup (85 g) sweetened shredded coconut. Toast the coconut in a dry skillet over medium heat for 2–3 minutes until golden, then stir into the icing.
- Mocha Texas Sheet Cake: Dissolve 1 tbsp instant espresso powder in the hot water before adding it to the butter and cocoa. This deepens the chocolate flavor without making the cake taste like coffee.
Storage and Reheating
Store the cake in an airtight container at room temperature for up to 3 days. The icing will stay soft and glossy. For longer storage, refrigerate for up to 5 days, but bring to room temperature before serving. To freeze, wrap the un-iced cake tightly in plastic wrap and foil for up to 3 months. Thaw overnight in the refrigerator, then bring to room temperature and add the icing fresh. Reheat individual slices in the microwave for 10–15 seconds to soften the icing, but avoid reheating the whole cake as it can dry out.
Frequently Asked Questions
Can I use a different pan? Yes, a 9×13-inch pan works, but the cake will be thicker and need about 5–7 minutes more baking time. A half-sheet pan (18×13 inches) will make a thinner cake that bakes faster—check at 15 minutes.
Why is my icing grainy? Grainy icing usually means the powdered sugar wasn’t sifted or the icing was over-stirred after the sugar was added. Sift the sugar first, and stir just until smooth.
Can I make this gluten-free? Substitute the all-purpose flour with a 1:1 gluten-free baking flour blend that contains xanthan gum. The texture will be slightly more tender, but it works well.
Do I have to use buttermilk? No, but it gives the cake its signature tang and tenderness. You can use plain yogurt thinned with a little milk, or the lemon juice/milk substitute mentioned in the tips.
Can I skip the nuts? Absolutely. The icing is just as good without them. If you’re allergic, simply omit them or replace with toasted sunflower seeds for crunch.
How do I know when the cake is done? Insert a toothpick into the center. If it comes out with a few moist crumbs, it’s done. If it’s wet batter, bake for another 2–3 minutes and check again.
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