Transfer the batter to the prepared baking pan. Arrange the pecan halves on top of the batter or if you’re using pecan pieces, sprinkle them evenly on top of the batter. Bake until a toothpick inserted into the center of the brownies comes out with a few moist crumbs attached, about 20-25 minutes. (If you hit a melted chocolate chip with the toothpick, test again in a different spot.) Do not over bake!