Peanut Butter Temptations

About 40 REESE'S Peanut Butter Cups Miniatures or 12 (0.75 oz. each) REESE'S Peanut Butter Cups, quartered

1/2 cup butter or margarine (1 stick) , softened

1/2 cup granulated sugar

1/2 cup light brown sugar packed

1/2 cup REESE'S Creamy Peanut Butter

1 egg

1/2 teaspoon vanilla extract

1-1/2 cups all-purpose flour

3/4 teaspoon baking soda

1/2 teaspoon salt