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Brown the sausage, mushrooms and green onions together.
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Once cooked, add them to the bottom of the slow cooker.
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Add the caramelized onions and spinach to the slow cooker.
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In a medium-sized bowl; whisk the eggs, make, salt and pepper together.
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Pour the eggs mixture over the ingredients in the slow cooker.
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Cover and cook on high for 2 hours and 15 minutes WITHOUT opening the lid.
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When done, turn slow cooker off, add the cheese to the top, replace the lid and allow the cheese to melt.
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If green onions have been reserved, garnish and serve.