To prepare a Willard Family German Chocolate Cake recipe, first you need to gather your ingredients. First, you'll need: Chocolate cake mix, butter, eggs, sugar, vanilla, and vanilla extract. Then, add the ingredients to the mixing bowl and mix until combined. Pour the batter into the greased and floured cake pan. Bake the cake in the preheated oven at 350 degrees for 35 to 40 minutes, or until the toothpick comes out clean. Allow to cool before cutting into squares.