Fold in apples. Next, pour the boxed yellow cake mix over the bottom layer of apple pie filling. Next, stir up the rest of the cake mix with sour cream (this makes it super fluffy and moist) and eggs. Yellow cake mix is my preferred combination in this recipe, however, white cake mix and spice cake mix … Gently shake the pan, or tamp it down on the counter to evenly distribute the cake mix. Beat in eggs and vanilla. Spoon into a greased 9-in. Last, pour half the coffee cake mix into your prepared baking pan, then add 1/2 the crumble, then more layer of cake mix and top with the rest of the crumble. In a small bowl, mix topping ingredients; sprinkle over batter. square baking pan. Combine flour, baking soda and salt; add alternately with sour cream to the creamed mixture. In a bowl, cream butter and sugar. Bake at 350° for 35-40 minutes or until done.