Texas sheet cake is a beloved Southern classic known for its rich chocolate flavor, tender crumb, and signature poured-on fudge frosting. This version uses a boxed cake mix to cut down on prep time while still delivering the same decadent, moist results. The warm frosting soaks into the cake as it cools, creating that iconic glossy top and irresistible texture.
Ingredients
- 1 box (15.25 oz / 432 g) chocolate cake mix (or devil’s food)
- 3 large eggs, at room temperature
- 1 cup (240 ml) water
- 1/2 cup (120 ml) vegetable oil
- 1/2 cup (115 g) sour cream, at room temperature
- 1 tsp vanilla extract
- 1/2 cup (1 stick / 113 g) unsalted butter
- 1/4 cup (60 ml) milk
- 3 tbsp (45 ml) heavy cream
- 1/4 cup (25 g) unsweetened cocoa powder
- 3 cups (360 g) powdered sugar, sifted
- 1 tsp vanilla extract (for frosting)
- 1 cup (120 g) chopped pecans or walnuts (optional)
Instructions
- Preheat your oven to 350°F (175°C). Grease a 13×18-inch (33×46 cm) half-sheet pan or a 12×17-inch (30×43 cm) jelly-roll pan with butter or nonstick spray.
- In a large mixing bowl, combine the cake mix, eggs, water, oil, sour cream, and 1 tsp vanilla. Beat with an electric mixer on medium speed for 2 minutes, scraping down the sides as needed. The batter will be thick and smooth.
- Pour the batter into the prepared pan and spread it evenly with a spatula.
- Bake for 25–30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. Do not overbake—the cake should be moist.
- While the cake bakes, make the frosting. In a medium saucepan, combine the butter, milk, heavy cream, and cocoa powder. Heat over medium heat, stirring constantly, until the butter is melted and the mixture is smooth. Bring to a gentle simmer, then remove from heat immediately.
- Whisk in the powdered sugar and 1 tsp vanilla until the frosting is smooth and glossy. If using nuts, stir them in now.
- As soon as the cake comes out of the oven, pour the warm frosting over the hot cake. Use an offset spatula to spread it evenly to the edges.
- Let the cake cool completely on a wire rack, about 1 hour, so the frosting sets. Slice and serve directly from the pan.
Tips
- Use room-temperature ingredients: Cold eggs and sour cream can make the batter lumpy. Set them out 30 minutes before starting.
- Don’t overbake: The cake continues to cook from residual heat after you pull it out. Start checking at 25 minutes—a toothpick with a few moist crumbs is perfect.
- Pour frosting while hot: The warm frosting soaks into the cake slightly, creating that classic fudgy top. If it cools too much, it becomes too thick to spread.
- Substitute buttermilk: For a tangier, more traditional flavor, replace the water with buttermilk. The cake will be slightly denser but equally delicious.
Serving Suggestions
Serve Texas sheet cake at room temperature, cut into squares, with a scoop of vanilla ice cream or a dollop of whipped cream. It’s also wonderful with a glass of cold milk or a cup of hot coffee. For a festive touch, sprinkle a little sea salt or extra chopped pecans on top before serving.
Variations
- Mocha: Add 1 tbsp instant espresso powder to the frosting along with the cocoa powder for a coffee-chocolate twist.
- Peanut butter: Swirl 1/2 cup (130 g) creamy peanut butter into the frosting just before pouring.
- Mint: Add 1/2 tsp peppermint extract to the frosting and top with crushed candy canes for a holiday version.
- Gluten-free: Use a gluten-free chocolate cake mix and ensure your other ingredients are certified gluten-free.
Storage and Reheating
Store leftover Texas sheet cake in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to 5 days. To reheat, microwave individual slices for 10–15 seconds to soften the frosting. You can also freeze the unfrosted cake for up to 3 months—wrap it tightly in plastic wrap and foil, then thaw overnight in the fridge before frosting.
Frequently Asked Questions
Can I use a different flavor of cake mix? Yes, but chocolate or devil’s food is classic. Yellow or white cake mix will produce a lighter, less chocolatey cake that still works with the chocolate frosting.
Can I make this cake ahead of time? Absolutely. Bake and frost the cake, then cover and refrigerate for up to 2 days. Bring to room temperature before serving for the best texture.
Why is my frosting grainy? This usually happens if the powdered sugar isn’t sifted or if the frosting is overmixed. Sift the sugar and stir just until smooth.
Can I use a different pan? A 9×13-inch (23×33 cm) pan will work, but the cake will be thicker and need 35–40 minutes of baking. Adjust the frosting amount if you prefer a thinner layer.
Do I have to use sour cream? No, you can substitute plain Greek yogurt or buttermilk. The sour cream adds moisture and tenderness, but the cake will still be good without it.
Can I freeze the frosted cake? Yes, freeze the fully cooled, frosted cake in an airtight container for up to 2 months. Thaw overnight in the refrigerator before serving.
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