Chocolate Peanut Butter Sandwich Cookies

INGREDIENTS

1 cup

creamy peanut butter (, room temperature)

8 tbsp

unsalted butter ((1 stick), room temperature (let the butter from refrigerator sit on the counter for about an hour or so))

1/2 cup

granulated sugar

1/2 cup

light brown sugar (packed)

large egg

2 cups

all-purpose flour (, sifted or aerated (see important note below!))

1/4 tsp

baking soda

1/4 tsp

sea salt

2 tbsp

unsalted butter (, room temperature)

1/4 cup

creamy peanut butter (, room temperature)

1/3 cup

powdered sugar

4 oz

semi-sweet chocolate