Next, pour the boxed yellow cake mix over the bottom layer of apple pie filling. Spoon into a greased 9-in. Bake at 350° for 35-40 minutes or until done. square baking pan. Next, stir up the rest of the cake mix with sour cream (this makes it super fluffy and moist) and eggs. In a bowl, cream butter and sugar. In a small bowl, mix topping ingredients; sprinkle over batter. 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. Yellow cake mix is my preferred combination in this recipe, however, white cake mix and spice cake mix … Combine flour, baking soda and salt; add alternately with sour cream to the creamed mixture. https://www.myfoodandfamily.com/recipe/170872/grandmas-best- Beat in eggs and vanilla. Fold in apples. Gently shake the pan, or tamp it down on the counter to evenly distribute the cake mix.