In a greased 8X12 or 9X9 pan, place batter inside and flatten. It will be thick – this is how it is supposed to be.
Sprinkle top with remaining sprinkles.
Bake for 20-30 minutes depending on oven. You will want to make sure the edges are brown and a toothpick comes out clean when inserted into the center.
You will want the bars to cool completely before cutting them. About 45-60 minutes.