Peanut Butter Sandwich Cookie Recipe

Make Cookies: Heat oven to 350°F. Line 2 baking sheets with parchment paper.

In a medium bowl, whisk flour, baking soda, baking powder, and salt.

In a large bowl, beat butter and sugars until well blended, then add peanut butter. Add egg and vanilla. Beat in flour mixture until just blended. Stir in peanut butter chips.

Drop 8 (2-tablespoon) balls of dough on each prepared baking sheet, about 3 inches apart. Press a floured fork to make a crosshatch design and spread dough into rounds. Bake 12 minutes. Cool completely on a wire rack.

Make Filling: Melt 2/3 cup bittersweet chocolate, chopped, and 6 tablespoons butter. Whisk until smooth, then stir in 1 teaspoon vanilla. Chill slightly.
 

Spread filling on one cookie bottom, then top with another to make a sandwich. Repeat with remaining cookies.