Butter a 2-qt. casserole dish. Spread green chilies and & cheese (& sausage, if desired) alternately for 3 layers, keeping a little cheese for top. Beat eggs, milk, and flour and pour over chilies/cheese layers. Drizzle Rotel over the casserole and top with remaining cheese. May refrigerate overnight.
Bake covered at 350 degrees for 45 mins. Remove foil and bake additional 15 mins uncovered. If doubled, bake approx 15 mins longer covered.
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