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Preheat oven to 350 F and spray a 9x13 baking dish with vegetable oil.
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Cook sausage in a large skillet on high heat, breaking it apart as you cook it, until it is browned, about 5-6 minutes.
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Remove sausage from pan, drain the fat.
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In a large bowl, whisk together 6 eggs, ¼ cup milk, salt and pepper.
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Add butter to skillet and heat on medium heat.
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Add eggs and cook, scrambling them until they’re just short of fully cooked.
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In the same bowl add remaining 6 eggs, remaining 1 cup milk and whisk well.
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Place ½ of the flour tortillas in the bottom of the baking dish.
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Then layer in order: half of the cheese, half of the salsa, eggs, sausage, remaining salsa and remaining cheese.
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Place the remaining tortillas on top.
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Pour the egg/milk mixture carefully over the casserole evenly.
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Bake uncovered for 35-40 minutes.
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Serve with sour cream, green onions, cheese and salsa.