Brown the sausage in a frying pan and set aside in a large mixing bowl. Leave the grease behind in the pan to sauté the veggies in.
Saute the onion, green pepper, and red pepper in the sausage grease with a few good pinches of sea salt, for about 5 minutes over medium high heat.
Add the garlic and cook for a minute.
Add the rice flour and cook for a minute.
Pour the veggie mixture into the mixing bowl with the browned sausage, and add the milk, sour cream, and cheese.
Shred the potato and add to the bowl.
Season the mixture with sea salt and pepper.
Pour the mixture into a buttered 9x13 baking dish and bake uncovered at 350 degrees for 60-70 minutes. Check it around the 50 minute mark in case our ovens run differently.
Notes
Feel free to use bacon instead of the sausage (use a full 12-ounce package and cook prior to stirring into the casserole).