Line a baking sheet with parchment paper. Set aside. Cream together butter, white sugar, and brown sugar in a large mixing bowl. Add eggs one at a time. Add in vanilla and peanut butter. Combine flour and soda in another bowl. Slowly add the dry mixture to the wet. Mix until just combined. Chill the dough for at least 1 hour. Preheat oven to 350. Scoop a Tablespoon of dough into your hand and roll it into a ball. Place on the baking sheet and press down slightly with a fork. Bake in the oven for 10 minutes. Remove and add one chocolate candy to the center of each cookie. Return the cookies to the oven for 2 minutes. Remove and allow the cookies to cool slightly before moving them to a wire rack. Cool completely before storing in an air-tight container. Makes 4 dozen cookies.