Butter sides and bottom of large oblong casserole/pan 8 x 13 inch. Remove crusts from 10 slices white bread, cube and place in pan. Grate 1 pound cheese over bread (Cheddar or mixture). Add 1 teaspoon dry mustard and salt and pepper to taste. 1 can Ortega chilies, cut up (3-4 ounce can). Lightly beat 12 eggs. Add 1 quart whole milk and add to above mixture. Let stand in refrigerator overnight. Cut up 1 pound bacon, cook partially and drain off fat. Sprinkle over top of souffle. Bake at 350 degrees for 45 minutes.