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Saute sausage in pan until cooked, break up into chunks, not small pieces. When completely cooked, pour meat in to a pan lined with paper towels, and let all of the excess grease drip out of the pan without wiping out the pan.
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Press the meat with paper towel to absorb grease. Set aside meat.
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Using the same pan, sauté the chopped onion in the remaining drippings from the sausage. Pour the onions on top of the meat.
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In large bowl or blender, beat the eggs. Add milk and seasonings to eggs.
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Butter all of the bread on one side (optional), cut or tear into pieces and lay into a greased 9x13 pan.
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Layer the cooked sausage, onion and green chiles on top of the bread.
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Top with the grated cheese.
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Pour the seasoned eggs over all.
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If you like a little color and flavor, top with salsa (about ½ cup) drizzled over cheese.
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Cover casserole with foil or plastic wrap and place in refrigerator overnight, or at least 1 hour.
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Bake uncovered at 300 degrees for 1 hour, until puffed and golden brown.
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Serve with salsa and sour cream.