These bars will remind you of the breakfast bars that are on the market these days. They are very easy to put together and you can really use any jam/preserves that you like. I used the blackberry because I had some that my mother made and because I really like blackberries. If you don't like the blackberry seeds you can buy the seedless to use.
Blackberry Oatmeal Crumble Bars Recipe
1 yellow or white cake mix
2 1/2 cups quick cooking oats
3/4 cup melted butter
1 cup blackberry jam
1 Tablespoon water if needed.
Bake in a preheated 375 oven for 18-23 minutes.