Cook the ground sausage until no longer pink and onions down to soften a bit.
Shred the cheese and in a bowl whisk together the 10 eggs with 3/4 c. milk. When you layer the ingredients into your crockpot make the first layer are your frozen hash browns.
Top that with 1/3 of your cooked breakfast sausage with onions, 1/3 of your cheese, seasonings, and 1/3 of your egg mixture.
Layer again this same way until you reach almost the top of your crockpot leaving some room at the very top. Put on low and cook for approximately 5 hours, check at about 4 hours if you want it to be a bit wetter in consistency.
It is done when egg in the very middle is no longer raw or opaque, and firmed.