Found the recipe here and made a few modifications. I think you could get really creative with your additions: dried fruit, coconut, nuts, chocolate chips...there are tons of possibilities! These tasted even better the next day!
4 c. dry oats (I used a combination of old-fashioned and quick
1 1/2 c. flour
1 c. brown sugar
1/2 c. sugar
1 t. cinnamon
1/2 t. salt
3/4 c. oil (I used 1/2 c. applesauce and 1/4 c. oil)
1 1/2 c. raisins (I used dried cranberries)
Mix together all ingredients until just combined.
Press into a greased 13×9 casserole dish and bake at 350 degrees for 25-30 minutes. Let cool completely before cutting into individual bars.