I love to bake and found this recipe in a baking cookbook that I have had for several years. It has become my go to dessert when I need something and don't want to go to the store. I usually have everything in my pantry to make these. Everyone loves them. Once I really made them last minute and they were still warm when I served them and they were wonderful. Now, sometimes I just warm them in the microwave for a few seconds. They are rich and decadent. Enjoy!
Preheat oven to 350 degrees. Generously spray a 13x9 inch pan with nonstick cooking spray. (Note: I usually line my pan with foil, leaving an overhang to remove from the pan after it cools. I spray the foil.)
In a mixer, blend the butter and both sugars. Add eggs, vanilla, and oats, and blend well. Fold in flour, baking powder, baking soda, and salt. Then fold in chocolate chips.
Spread batter in the prepared pan. Top with dollops of dulce de leche and then swirl or smear dulce de leche into batter. (Note: the dulce de leche is very thick, that's why I say smear.)
Bake for 38 minutes or until batter set (not wobbly and jiggly). If they seem browned around the edges but still jiggle in the center, reduce oven temperature to 325 degrees and continue baking 10-15 minutes longer or until set.
Refrigerate or freeze 1 hour. Cut into large hunks or blocks.