In a skillet, brown sausage along with the red pepper and onions. Drain off any excess grease.

Add in spinach and cook for another minute or two until the spinach is wilted. Remove from heat and allow to cool.

In a large bowl, whisk the eggs, salt, pepper, and milk together. Add hashbowns and cooled sausage mixture. Stir until combined.

Spray a 9 x 13 pan with non stick spray. Pour the egg mixture into the sprayed pan. Sprinkle with the cheese. Cover and refigerate overnight.

Preahet oven to 350 degrees. Bake uncovered for 25-30 minutes or until eggs are set. You can test this by inserting a knife into the center of the casserole and see if it comes out clean. Serves 6-8.