cook/crumble and then drain sausage on paper towels (or use bacon and drain and crumble)
place oil in muffin tins (just enough to keep the hash browns from sticking and to become crisp while cooking) and put frozen hash browns in bottom of tins (as much as you'd like but leave room for other ingredients), hash browns will cook down. Add shredded cheese on top. Salt and pepper to taste (or use Tony Chachere's as I did). Place muffin tins into preheated 425 degree oven for about 15 minutes.
while hash browns are cooking chop onion and bell pepper (if using) and scramble eggs. I use jumbo eggs so I found one egg per every two muffin cups was needed, I add a little milk to my eggs as well. If you are using raw veggies steam them, microwave them, saute' them. whichever you prefer to soften them up some. If you are using frozen, thaw on paper towels to absorb the extra water. Fresh is always best.
when hash browns are ready remove from oven and put your sausage (or bacon) in the cups with onion and green peppers (if you are using them). Pour eggs over, NOT filling the cups, the eggs will rise as they cook. Sprinkle more cheese on top, more the better! Place in a 350 degree oven for 15-18 minutes. Start checking them at 15 (mine were done in 15). Remove from muffin tins, serve with salsa or syrup or ... your choice... ENJOY!