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Preheat oven to 350 F. Line two baking sheets with parchment paper.
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Beat sugar, butter, and peanut butter together until well mixed.
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Add egg and vanilla and beat until well mixed.
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Add flour, baking powder, baking soda, and salt. Beat on low speed until well mixed.
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Divide batter into two bowls. Stir peanut butter and milk chocolate chips into one bowl and peanut butter chips and m&ms into the other bowl.
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Using a spoon or cookie scoop, drop batter onto prepared baking sheets.
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Refrigerate dough for 15-30 minutes.
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Bake for 8-10 minutes or until edges are lightly browned. Let cool on baking sheets for 3 minutes before transferring to wire racks.