Peanut Butter Filling
3/4 cup creamy peanut butter
3/4 cup powdered sugar
Cookies
1/2 cup butter, room temperature
1/4 cup creamy peanut butter
1 cup light brown sugar
1 teaspoon pure vanilla extract
1 egg + 1 egg yolk
1/2 cup cocoa powder
1/2 teaspoon kosher salt
1/2 teaspoon baking soda
1 1/2 cups flour
1/4 cup granulated sugar