I got this recipe from a coworker, warning: it's highly addictive! It's a perfect combination of salty, sweet, and a little chocolate. I was a little hesitant about microwaving the mixture in a bag, but it turns out well. You could definitely add more M&M's if you'd like. I've made this for holidays and used festive M&M's (red/white/blue for the 4th of July, red/green for Christmas). Total cook time includes cooling.