Preheat oven to 350º and grease/flour a 9x13 inch pan. In a large mixing bowl add cake mix, milk, melted butter, pudding mix, eggs, vanilla, and cinnamon. Blend with a hand mixer for 1 minute at low speed. Stop and scrape down all sides of bowl and increase mixer speed to medium for 2 more minutes. Pour batter into 9x13 pan and spread out evenly. Bake at 350º for 32-38 minutes (I always check at 32 minutes) or until a toothpick inserted in the middle comes out clean. Cool on a wire rack. Frost with the following Butter Cream Frosting recipe:.
BUTTER CREAM FROSTING.
8 Tbls. (or 1 stick) butter (slightly softened).
3 3/4 cups confectioners` sugar.
3-4 Tbls. Milk (I used 4 Tbls.).
1 teas. vanilla extract.
1 teas. Cinnamon.
Place all ingredients in mixing bowl and beat on low/ medium until fluffy. Spread on cooled cake. ENJOY!