- Preheat the oven to 375 degrees F (190 degrees C). Grease a 9x13 inch pan.
- In a large bowl, mix together oats, cake mix, and melted margarine so that it makes nice clumps and there is no dry mix left. Press 1/2 of the oats mixture evenly into the bottom the prepared pan. In a separate bowl, mix jam with water, and spread over the crust. Sprinkle the remaining oat mixture evenly over the top.
- Bake in the preheated oven for 18 to 23 minutes, or until the top is lightly browned. Cool before cutting into bars.