Brown hamburger meat and onion. Drain grease. While meat is browning, combine in chilis, beans, and cheddar cheese soup in saucepan and heat til warm. Get your 9x13 pan out and fill it with Nacho cheese doritos (you may smash down to add room). After draining grease from meat, put meat on top of chips, then pour your mixture on top of meat. Last, shred your cheese and cover your mixture. Slide in the oven just long enough to melt cheese. Enjoy!!!!