Easy Texas Turtle Sheet Cake

2. In a saucepan, combine 1 cup butter, 1 cup coffee, and 1/3 cup cocoa. Bring to a boil, stirring constantly. Pour into the prepared dry ingredients. Using a hand-held mixer, mix on medium speed until wet and dry ingredients are thoroughly combined. Add eggs and the 1/2 cup of buttermilk. Mix on medium speed for another minute or so, until well combined.

3. Pour into baking pan, and bake for 25-30 minutes. When cake is done baking, a toothpick or fork inserted into the middle of the cake should come out clean.