1 loaf (8 oz.) Italian bread, sliced 1/2-inch thick
1 pkg (8 oz.) sliced Swiss or American cheese
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Let's Make It
1. In a medium bowl beat eggs, milk and mustard; set aside. In a medium skillet melt butter. Add mushrooms and onions. Saute until golden, about 5 minutes; remove from heat.
2. Arrange half of the bread slices in a buttered 9-inch square baking pan. Spoon half the mushroom mixture over the bread. Pour half of the milk mixture over all. Cover with half of the cheese slices. Repeat layering with remaining bread, mushroom and milk mixtures and cheese. Cover and refrigerate 1 to 24 hours.
3. Preheat oven to 325 degrees F. Bake, uncovered, until puffed and knife inserted in the center comes out clean, 30 to 35 minutes. If desired, brown under broiler.