Chocolate Chip Oatmeal Cookies

Butter (melted and cooled, 1 1/2 sticks)

White sugar (1/2 cup)

Brown sugar (1 cup)

Vanilla extract (1 tbsp)

Ground cinnamon (1 tsp)

Egg (1)

Egg yolk (1)

All purpose flour (2 cups)

Salt (1/2 tsp)

Baking soda (1/2 tsp)

Quick oats (1 1/2 cups)

Chocolate chips (1 cup)