Preheat oven to 350 degrees.  Line baking sheet with parchment paper and set aside.

Mix cake mix, butter, eggs and flour until combined.  Add M&M's and stir again. 

Using a mini cookie scoop, measure out a bit of dough and roll into a ball. Then roll in the powdered sugar and place on cookie sheet.

Bake for 10-12 minutes, then remove from oven and give baking pan a few good pats against the counter to achieve the perfect crinkle (very important!). Let them sit on the baking sheet another 2 minutes or so and then transfer to wire rack. 

Once completely cooled, dust with powdered sugar and enjoy!