Reese’s-Stuffed Peanut Butter Chocolate Chip Cookies

INGREDIENTS

Egg plus 1 egg yolk

11 1/4 oz

Peanut butter, creamy

Reese's peanut butter cups, mini

7 1/2 oz

(1 cup, packed) brown sugar, packed

1/2 tsp

Baking powder

1/2 tsp

Baking soda

9 oz

Chocolate chips

1 tbsp

Cornstarch

1/2 tsp

Salt

1 tbsp

Vanilla extract

4 oz

Butter, unsalted

9 1/2 ounces (2 1/4 cups, spoon and level) all-purpose flour, sifted