yellow cake mix (I used a cupcake mix instead)
2 tbsp. dry cake mix
1 tbsp. cinnamon
1 tbsp. cocoa
2 tbsp. brown sugar
In a separate bowl combine the first four ingredients. Grease or spray pan and lightly flour. I used a bundt pan and liked the way it turned out. Prepare cake mix according to the instructions on the box. Fill the pan with 1/4 of the batter. Spoon streusel topping over the batter, topping with remaining batter. With a knife, circle batter to create a swirled effect.
Bake at 350 degrees for approximately 30 minutes or until cake tests done. Cool for 5-10 minutes before removing from the pan. Lightly glaze the cake with powdered sugar mixed with a small amount of milk. I didn't use exact measurements for that and it turned out just fine. I also added a touch of vanilla.