In a large bowl, combine the flour, baking soda, baking powder, and salt. Set aside. Cream together the butter and peanut butter.
Add the sugars and beat until light and fluffy.
Add the egg, vanilla, and milk. Beat well.
Beat in the dry ingredients and mix until combined.
Mix in the milk chocolate and peanut butter chips.
Roll the dough into balls and roll in the sanding sugar.
Use the bottom of a glass and slightly flatten the bottom of the cookies.
I wanted to make these cookies festive for Valentine’s Day, so I added peanut butter M&Ms to tops of my cookies.
Press a few of the M&Ms in the tops of the cookies.
Bake in a preheated 350 degree oven for 10 to 12 minutes. Be careful to not overbake these.
Cool on the baking sheet for a minute, then let them cool completely on a cooling rack.