1 1/4 c. butter, divided
2 c. sugar
1 1/4 c. Dr. Pepper, divided
7 tbsp. cocoa, divided
1 1/2 tsp. cinnamon
2 c. flour
2 eggs
1/2 c. buttermilk
1 tsp. baking soda
1 tsp. vanilla

Cream 1 cup butter and sugar until light and fluffy. Add 1 cup Dr. Pepper and mix well. Stir in 4 tablespoons cocoa, cinnamon and flour; mix thoroughly. Add eggs, buttermilk and soda; beat until creamy. Pour into 13 x 9 x 2-inch baking pan.

Bake in a 350°F gas oven for 40 to 45 minutes. Five minutes before cake is done, melt remaining butter, cocoa and Dr. Pepper with vanilla; mix well. Pour over hot cake.