Combine topping ingredients and set aside. In a mixing bowl, combine cake and pudding mixes, sour cream, eggs, oil and lemon flavoring. Mix on medium speed for 2 minutes. Pour 1/2 into a greased bundt pan.
Sprinkle half of the topping over batter. Spoon remaining batter over topping and spread evenly. Sprinkle with remaining topping. Bake at 350 degrees for 30-35 minutes or until cake tests done. Yields 12-16 servings.