Peanut Butter S'mores Cookies

1 1/2c. All purpose flour
1/2t. baking powder
½ t. baking soda
¼ t. salt
1/2c. softened butter
½ c. granulated sugar
½ c. packed brown sugar
½ c. creamy or chunky peanut butter
1 egg
1t. vanilla
4 (1.55 oz) milk chocolate candy bars
16 large marshmallows

1. Preheat oven to 350.
2. Combine the flour, baking powder, baking soda and salt in a small bowl; set aside.
Beat butter and sugars in a large bowl of an electric mixer at medium speed till light and fluffy. Beat in peanut butter egg and vanilla until well blended. Gradually beat in flour mixture on low speed until blended.
3. Roll dough into 1in. balls; place 2in. apart on ungreased cookie sheets. Flatten dough with tines of fork, forming criss-cross pattern.
Bake about 14 min. or until set, and edges are light golden brown.
Cool cookies 2min. on cookie sheets; transfer to wire cooling racks. Cool completely.
4. To assemble sandwiches, break each candy bar into 4 equal sections. Place one section of chocolate on flat side of one cookie. Place on microwaveable plate; top with one marshmallow. Microwave at high 10-12 seconds, or until marshmallow is puffy. Immediately top with another cookie, flat side down. Press slightly. Repeat with remaining cookies, chocolate, and marshmallows. Cool completely

Yields about 16 sandwich cookies