01 - Preheat oven to 350°F and line baking sheet with parchment paper.
02 - Mix rolled oats and chocolate chips in large bowl until evenly distributed.
03 - Pour melted butter and brown sugar over oat mixture. Stir until fully combined and mixture holds together when pressed.
04 - Drop tablespoon-sized portions onto prepared baking sheet. Flatten each mound slightly with back of spoon.
05 - Bake 12–15 minutes until edges are golden brown and cookies are set.
06 - Let cookies cool on baking sheet 5 minutes, then transfer to wire rack to cool completely.