Ingredients
Method
Instructions
- Preheat your oven to 350°F. Grease a 15x10-inch jelly roll pan or a 9x13-inch baking pan.
- In a large mixing bowl, whisk together flour, sugar, baking soda, and salt until well combined.
- In a medium saucepan, combine butter, water, and cocoa powder. Bring to a boil over medium heat, stirring constantly.
- Remove from heat and pour the hot mixture over the dry ingredients. Stir until just combined.
- In a separate small bowl, whisk together sour cream, eggs, and vanilla extract.
- Add this to the cake batter and 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 is baking, prepare the frosting by combining butter, cocoa powder, and milk in a medium saucepan.
- Bring to a boil, then remove from heat.
- Whisk in powdered sugar and vanilla extract until smooth. If using nuts, stir them in at this point.
- Once the cake is out of the oven, immediately pour the warm frosting over the hot cake.
- Use a spatula to spread it evenly across the surface.
- Allow the cake to cool completely before cutting into squares.
Notes
Choose the right pan: A jelly roll pan gives traditional thin Texas sheet cake texture, while a 9x13-inch pan creates thicker cake. Don't overmix the batter. Use room temperature eggs and sour cream. Pour warm frosting over hot cake immediately for signature fudgy texture.
