Brown Sugar-Chocolate Chip Sandwich Cookies

This recipe is a variation of two different recipes from Joy the Baker. It's good with or without the cinnamon.

3/4 cup butter, softened

1 1/4 cups dark brown sugar
1 tsp. vanilla extract
1 egg
2 cups all-purpose flour
2 tsp. baking soda
1/2 tsp. salt
1/2 tsp. cinnamon (optional)

1 cup chocolate chips

Peanut Butter Filling

1. Beat butter and brown sugar on medium speed until light and fluffy. Beat in vanilla and egg until blended, scraping down the sides of the bowl, if needed.
2. Beat in flour, next 2 ingredients, and, if desired, cinnamon until well blended. Add in chocolate chips. Use a 1-tablespoon scoop to place cookie dough on parchment paper-lined baking sheets.

3. Bake at 350° for 10 minutes. Cool on pan for 5 minutes; cool completely on wire racks. Spread Peanut Butter Filling on one side of half of cookies; top with remaining cookies.

Peanut Butter Filling:

4 Tbsp. butter, softened
1/2 cup creamy peanut butter
1 cup powdered sugar
2 Tbsp. milk

1. Beat together all ingredients until smooth.