In a mixer fitted with the paddle attachment, blend together the flour, sugar, baking powder and salt. Add in the peanut butter and mix until downey with some pea-size crumbs interspersed. In a separate small bowl, mix together the milk, egg and melted butter. Gradually add this to the turning flour-peanut-butter mixture until just combined. Stir in the chopped Snickers bars with a big spoon.