Preheat oven to 375F and line a baking sheet with parchment paper.
In a bowl, cream butter and sugars until fluffy.
Add eggs and vanilla and mix until smooth.
Mix in baking soda and salt. Fold in flour, just until combined.
Gently fold in cereal and m&m's.
Bake for 8 to 10 minutes.
Cool slightly before transferring to a wire cooling rack.
ENJOY!