A great friend is in town and we decided to bake oatmeal chocolate chip cookies this evening. He convinced me to bake them longer (17-20 minutes) as opposed to my usual 12, and they turned out even more amazing than I could have imagined. They actually browned and stayed chewy. I also substituted 1 cup regular rolled oats for 1 cup quick oats because I didn't have enough quick oats, and the recipe was just fine.
I guess the lesson learned is that I need to work with my oven more rather than follow a recipe so stringently that I don't get the desired result.