Brown sausage in skillet until crumbled and cooked through Drain off grease and set aside Saute onion and green pepper in butter until tender Combine rice eggs milk 1 cup cheese dry mustard salt and pepper Add sausage onion and green pepper to this mixture Pour into a 9 x 13 greased casserole dish Bake uncovered at 350 for 30 to 40 minutes Top with other cup of cheese and stick back in oven until melted Allow dish to set 10 minutes before serving