8 slices bread
3/4 lb. Monterey Jack cheese, grated
Dry onion flakes
3 c. milk
1 tsp. Worcestershire sauce
1 pkg. frozen spinach, very well drained
Butter
1/4 lb. sharp cheddar cheese, grated
1/4 lb. Swiss cheese, grated
4 eggs
1/4 tsp. mustard
Salt & pepper to taste

Trim crusts from bread, butter bread on one side, cut into 1" cubes. Place bread, buttered side up, on the bottom of a buttered 9"x13" baking dish. Do 2 layers of bread, cheese, spinach, bread, etc. Beat eggs in a mixing bowl, stir in milk, mustard, Worcestershire sauce, salt and pepper; pour over cheese, spinach, bread layers. Refrigerate overnight (or up to 2 days ahead). Let stand 1 hour before baking. Place baking dish into a large pan of water in oven, bake at 350 degrees, 45 to 50 minutes (check and do longer if necessary). Turn off oven, let souffle sit in oven another 30 minutes.