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