In a medium skillet, brown the sausage, red pepper flakes and green onion over medium heat until fully cooked and no longer pink. Remove the sausage with a slotted spoon to drain the fat. Spread the cooked sausage over the bread and top with the cheese. Stir together the half-and-half, dry mustard, salt and eggs. Pour this mixture over the cheese. Cover the casserole with aluminum foil and refrigerate for 8 hours or overnight.
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