Melt the butter in a medium bowl. Add in the brown sugar, egg, flour, oats, baking powder, cinnamon, and vanilla extract, mixing well into a dough.
2 Tbsp Butter, 3 Tbsp Brown Sugar, 2 Tbsp Egg, ¼ Cup Flour, ¼ Cup Quick-Cook Oats, ⅛ Tsp Baking Powder, ⅛ Tsp Cinnamon, ¼ Tsp Vanilla Extract