Not completely scratch b/c I do use a bottled marinade although you could certainly forgo this and make your own. 1 pkg of chicken breasts (either bone in or cutlets, bought on sale ofcourse ) washed and placed in bottom of crockpot. 1 large onion cut up in rings, 1 large bell pepper or 2 if you really love bell peppers with your fajitas. Place both on top of the chicken and pour a bottle of Chipotle Lime Marinade or whatever type you want to use, not as important as the crockpot imho. Season with a little salt and pepper and cook on low for 6-8 hours. Make a homemade guacomole to go with, serve on warmed tortillas with salsa and shredded cheese. YUM!