Texas sheet cake is a beloved Southern classic known for its rich, fudgy texture and signature poured-on chocolate frosting. Using a chocolate cake mix as the base makes this version incredibly simple and foolproof, while still delivering that dense, moist crumb and glossy icing that define the original. The hot fudge-like frosting soaks into the warm cake, creating a decadent dessert that’s perfect for potlucks, birthdays, or any casual gathering.
Ingredients
- 1 box (15.25 oz / 432 g) chocolate cake mix (with pudding in the mix)
- 3 large eggs
- 1 cup (240 ml) buttermilk
- 1/2 cup (120 ml) vegetable oil
- 1 teaspoon vanilla extract
- For the frosting:
- 1/2 cup (1 stick / 113 g) unsalted butter
- 1/4 cup (60 ml) milk
- 3 tablespoons (25 g) unsweetened cocoa powder
- 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 13×18-inch (half-sheet) jelly roll pan or a 15×10-inch rimmed baking sheet with butter or nonstick spray.
- In a large bowl, combine the cake mix, eggs, buttermilk, oil, and vanilla. Beat with an electric mixer on medium speed for 2 minutes, or until the batter is smooth and well combined. The batter will be slightly thick.
- Pour the batter into the prepared pan and spread it evenly to the edges.
- Bake for 25–30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs (not wet batter). The cake should spring back lightly when touched.
- While the cake bakes, make the frosting. In a medium saucepan, melt the butter over medium heat. Add the milk and cocoa powder, whisking until smooth. Bring to a gentle simmer, then remove from heat.
- Stir in the powdered sugar and vanilla, whisking until the frosting is smooth and glossy. If you’re using nuts, fold them in now.
- Immediately after the cake comes out of the oven, pour the warm frosting over the hot cake. Use a spatula to spread it evenly—it will be thin but will set as it cools.
- Let the cake cool completely on a wire rack before cutting into squares. The frosting will firm up into a fudge-like layer.
Tips
- Buttermilk substitute: If you don’t have buttermilk, mix 1 cup (240 ml) milk with 1 tablespoon lemon juice or white vinegar and let it sit for 5 minutes. This will mimic the tang and acidity of buttermilk, which helps tenderize the cake.
- Don’t overbake: The cake should be moist and fudgy. Overbaking will make it dry. Start checking at 25 minutes.
- Pour frosting on hot cake: The frosting must be poured over the cake while both are warm. This allows the frosting to seep into the top layer, creating that classic Texas sheet cake texture. If the cake cools first, the frosting won’t soak in.
- Storage: Cover the pan tightly with foil or plastic wrap. The cake keeps well at room temperature for up to 3 days, or in the refrigerator for up to 5 days.
Serving Suggestions
Texas sheet cake is delicious on its own, but a scoop of vanilla ice cream or a dollop of whipped cream balances the rich chocolate beautifully. For a Southern touch, serve it with a glass of cold milk or sweet tea. It’s also great for breakfast the next day (if you’re bold!) with a strong cup of coffee.
Variations
- Mocha twist: Add 1 tablespoon instant espresso powder to the batter and 1 teaspoon to the frosting for a deeper coffee-chocolate flavor.
- Peppermint: Replace the vanilla in the frosting with 1/2 teaspoon peppermint extract, and top with crushed candy canes for a holiday version.
- Gluten-free: Use a gluten-free chocolate cake mix and ensure your other ingredients (like powdered sugar) are certified gluten-free. The texture may be slightly different but still delicious.
- Nut-free: Simply omit the pecans or walnuts from the frosting. The cake is just as good without them.
Storage and Reheating
Store leftover cake in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to 5 days. The frosting will firm up when chilled—let it come to room temperature before serving for the best texture. To reheat individual slices, microwave for 15–20 seconds until warm and fudgy. You can also freeze the unfrosted cake (wrap tightly in plastic wrap and foil) for up to 3 months; thaw overnight in the fridge, then frost and serve.
Frequently Asked Questions
Can I use a different size pan? Yes, but baking time will change. For a 9×13-inch pan, bake for 35–40 minutes. For a 10×15-inch jelly roll pan, bake for 25–30 minutes. Just keep an eye on it and test with a toothpick.
Why is my frosting grainy? This usually happens if the powdered sugar isn’t sifted or if it’s added too quickly. Make sure to sift the sugar and whisk thoroughly. Also, ensure the butter mixture is hot enough to dissolve the sugar—if it cools too much, the frosting can become grainy.
Can I make this ahead of time? Absolutely. The cake actually tastes better the next day as the flavors meld. Bake and frost it, then cover and store at room temperature for up to 24 hours before serving.
Can I use a different flavor of cake mix? Yes, but it won’t be a traditional Texas sheet cake. A devil’s food or dark chocolate mix works well. If you use a yellow or white mix, the result will be more like a chocolate-frosted sheet cake, which is also tasty but not the same.
Do I have to use buttermilk? No, you can substitute regular milk, but the cake will be slightly less tender and tangy. Buttermilk helps activate the leavening in the mix and adds moisture.
Can I freeze the frosted cake? Yes, you can freeze the entire frosted cake. Place it in the freezer uncovered for 1 hour to firm up the frosting, then wrap tightly in plastic wrap and foil. Freeze for up to 3 months. Thaw in the refrigerator overnight before serving.
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