This is the EASIEST recipe and so yummy. These caused me to cheat on my diet several times this week. You can use any kind of jam (apricot, raspberry, strawberry, etc.) I used my homemade strawberry preserves for this batch.
1 box white or yellow cake mix (I used French Vanilla)
2 cups oatmeal
3/4 c. butter, melted
1 bottle jam (any flavor)
Mix cake mix and oatmeal together. Stir in melted butter until well combined. Press half of the mixture on the bottom of a greased 13x9 cake pan. Spread jam all over the top (thin the jam with a teaspoon or two of water if it is really thick). Spread rest of crumb mixture all over the top and pat down. Bake at 350 degrees for 20 minutes. Cool and cut into squares.