Ingredients
Method
Instructions
- Preheat your oven to 350°F (175°C). Grease and flour a 15x10-inch jelly roll pan or a similar-sized baking sheet.
- In a large mixing bowl, whisk together the flour, sugar, baking soda, and salt until well combined.
- In a medium saucepan, melt the butter over medium heat. Add the cocoa powder and water, stirring constantly until smooth. Bring the mixture just to a boil, then remove from heat.
- Pour the hot chocolate mixture over the dry ingredients and mix until well combined. The batter will be thick at this stage.
- Add the sour cream, eggs, and vanilla extract to the batter. Mix until smooth and well incorporated.
- Pour the batter into your prepared pan and spread evenly. Bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
- While the cake bakes, prepare the frosting. In a medium saucepan, combine the butter, cocoa powder, and milk. Heat over medium, stirring constantly, until the butter melts and the mixture is smooth.
- Remove from heat and whisk in the powdered sugar and vanilla until smooth. Stir in chopped nuts if using.
- As soon as the cake comes out of the oven, pour the warm frosting over the hot cake. Spread evenly with a spatula.
- Allow the cake to cool completely before slicing and serving. This allows the frosting to set perfectly.
Notes
Room temperature ingredients ensure smooth batter; don't overbake - cake is done when it springs back lightly; pour warm frosting over hot cake for signature Texas sheet cake texture; stores well in airtight container; Greek yogurt can substitute for sour cream
