Lemon Cake

My husband and I agree that my best lemon cake recipe is this one, but this one is a close second.  It is tasty and easy.

Lemon Cake
1 box vanilla cake mix
Eggs, oil, and water indicated on the cake mix
1 15 oz can lemon pie filling
1 tub lemon frosting
1 8 oz. cool whip, thawed

Preheat oven to 350
Spray a 9 x 13 pan.  Prepare cake mix as directed.  Pour batter into prepared pan.  Place spoonfuls of lemon pie filling all over the cake batter.  Take a knife and swirl it around throughout the batter.  Bake at 350 for about 35-40 minutes until cake no longer jiggles in the center.  Cool completely.
Frosting
Mix together the frosting and the cool whip.  Spread over the cooled cake.