In a large frying pan, fry the bacon pieces on medium heat (set the whole pieces aside). Remove to a bowl and absorb the bacon grease with paper towels. Fry the whole pieces; set aside.
Spray a 6 quart slow cooker with cooking spray.
Layer 1/2 of the potatoes on the bottom of slow cooker. Top with half of the bacon, cheese, pepper and onions. Repeat layering.
Beat eggs, milk, and green chilis in a large bowl, with a wire whisk, until well blended. Salt and pepper.
Pour evenly over potato-bacon mixture. Top with whole pieces of bacon.
Cook on low setting for 6-7 hours, or on high setting for 3-4 hours, or until eggs are set.
Top with green onions; serve! Optional to serve with sour cream and fresh salsa.