Soft and Chewy Peanut Butter Oatmeal Chocolate Chip Cookies

INGREDIENTS

1/2 cup

unsalted butter, melted (1 stick)

heaping 1/3 cup creamy peanut butter

large egg + 1 yolk (discard extra white or save for another use)

3/4 cup

light brown sugar, packed

1/2 cup

granulated sugar

teaspoons vanilla extract

1 cup

old-fashioned whole rolled oats (not instant or quick cook)

1 1/4 cups

all-purpose flour

1/2 tsp

baking soda

1/2

teaspoon salt, or to taste

3/4

cup semi-sweet chocolate chips

1/2 cup

peanut butter chips (white chocolate or butterscotch chips may be substituted)