01 -
Preheat oven to 350°F and line two baking sheets with parchment paper.
02 -
In a large bowl, stir together oats, flour, brown sugar, granulated sugar, baking soda, and salt until evenly mixed.
03 -
Pour melted butter, beaten egg, and vanilla extract into the dry mixture and stir gently until a smooth, slightly sticky dough forms.
04 -
Fold in chocolate chips or chunks until evenly distributed throughout the dough.
05 -
Using a tablespoon or cookie scoop, drop rounded mounds onto the prepared baking sheets, spacing them about 2 inches apart.
06 -
Bake in the preheated oven at 350°F for 10 to 12 minutes, or until edges are golden brown.
07 -
Transfer the cookies to a wire rack and allow them to cool completely before serving.