Magnolia Bakery's Peanut Butter Cookies

1 1/4 c all-purpose flour
3/4 tsp baking soda
1/2 tsp baking powder
1/4 tsp salt
1/2 c unsalted butter, softened
1 c chunky style peanut butter
3/4 c sugar (plus extra for sprinkling)
1/2 c firmly packed light brown sugar
1 large egg, at room temperature
1 tablespoon milk
1 teaspoon vanilla extract
1 c peanut butter chips

Directions

Preheat oven to 350 degrees.
In a large bowl, combine the flour, the baking soda, the baking powder, and the salt. Set aside.
In a large bowl, beat the butter and the peanut butter together until fluffy. Add the sugars and beat until smooth. Add the egg and mix well. Add the milk and the vanilla extract. Add the flour mixture and beat thoroughly. Stir in the peanut butter chips. Drop by rounded spoonfuls onto ungreased cookie sheets, leaving several inches between for expansion. Using a fork, lightly indent with a crisscross pattern but do not overly flatten cookies. Lightly sprinkle cookies with sugar. Bake for 10-12 minutes. Do not overbake. Cookies may appear to be underdone, but they are not.
Cool the cookies on the sheets for 1 minute, then remove to a rack and cool completely.
Makes 2-3 dozen cookies.