Lemon Brownie Cake

1 box (18.25 ounce size) lemon cake mix
1/2 cup butter melted
1 egg, slightly beaten
1 can lemon frosting
8 ounces cream cheese
2 eggs

Combine cake mix, butter and first egg. Press into a greased 13 x 9- inch pan. Blend frosting and cream cheese. Remove 3/4 cup of mixture and set aside. Add the remaining eggs and beat well. Spread over layer in greased pan. Bake at 350 degrees F for 30 minutes. Spread the remaining frosting over cooled cake.