Preheat oven to 350 degrees and lightly grease a 9x13 in baking pan.

In a large bowl, combine sugar cookie mix, pudding, and flour. Add the melted butter and eggs and mix until incorporated. A wooden spoon works very well, an electric mixer risks over-mixing. Fold in the white chocolate chips.

Place sugar cookie mix in greased pan and use a spatula to spread it out. Sprinkle with m&ms.; I used both milk chocolate and peanut butter Easter m&ms.;

Bake for 15-20 minutes, being careful not to overbake. Let cool completely before serving (if you can!)