Chocolate-dipped peanut butter cookies

? cup butter, softened
1 cup peanut butter
? cup sugar
? cup firmly packed brown sugar
1 egg, beaten
1 ? teaspoons vanilla extract
1 ? cups flour
1 ? teaspoons baking powder
? teaspoon salt
1 cup chocolate chips
1 cup vanilla baking chip

Cream the butter and peanut butter together. Add the sugar and beat until light and fluffy, then add in egg and vanilla. Mix until just combined. In another bowl, combine the flour, baking powder and salt. Add to creamed mixture. Shape dough into a roll about 2-inches in diameter. Wrap in wax paper and chill at least three hours in the refrigerator.
When ready to bake, remove the wax paper and cut into ?-inch slices. Place 2 inches apart on a cookie sheet and bake at 350 degrees F for about 10 minutes. Remove and let cool.
While cookies are baking, place the chocolate and vanilla chips in two microwave-safe bowls. Microwave or one minute, then stir. Continue in 30-second intervals until the chocolate is completely melted and smooth. Take the cooled cookie and dip halfway into either the white or dark chocolate. Let the excess drip back into the bowl, then set the cookie on a sheet of wax paper to dry. Alternate using the white and dark chocolate until all cookies are dipped.