Texas Sheet cake

Ingredients

1 cup water

1 cup butter

3 Tablespoons unsweetened cocoa powder

2 cups all-purpose flour

2 cups granulated sugar

1 teaspoon baking soda

1/2 teaspoon salt

1/2 cup sour cream

2 large eggs

1 teaspoon vanilla extract

For the Frosting

6 Tablespoons milk

3 Tablespoons unsweetened cocoa powder

1/2 cup butter

3 3/4 cups powdered sugar

Instructions