Kick the tires and light the fires to 350 degrees.
Cream together your butter and sugar until it's light and fluffy.
Add in the eggs and vanilla, mixing thoroughly.
Beat in the flour, baking soda and salt. When that is done, fold in the two cups of M&M's by hand, and prepare to put them on some parchment paper lined cookie sheets.
Drop by rounded teaspoonful onto the baking sheets.
Bake at 350 degrees for 10-12 minutes, until golden brown and slightly underdone.