Peanut Butter Do-si-dos Cookie Sandwiches (Copycat)

INGREDIENTS

Peanut Butter Cookies

1 1/2 sticks

unsalted butter (, room temperature)

1/2 cup

packed dark-brown sugar

1/3 cup

granulated sugar

1/2 cup

chunky peanut butter

1 cup

plus 2 tablespoons all-purpose flour

1 cup

quick oats ((I use Bob's Red Mill))

1 tsp

baking soda

1 tsp

salt

Peanut Butter Buttercream Filling:

1/2 stick

butter (, room temperature)

1 1/2 cups

powdered sugar

1 tbsp

milk

1/2 cup

creamy peanut butter