Gruyere & Prosciutto Strata Recipe

In a large skillet, heat oil over medium-high heat. Add prosciutto; cook and stir until crisp. Remove from pan with a slotted spoon. Add onions to the same pan; cook and stir until tender. In a large bowl, whisk egg substitute, milk, mustard and pepper. Stir in bread and onions. Reserve 2 tablespoons cooked prosciutto for topping; stir remaining prosciutto into bread mixture. Transfer half of the mixture to a greased 13x9-in. baking dish; sprinkle with half of the cheese. Top with remaining bread mixture. Separately cover and refrigerate strata and reserved prosciutto overnight. Preheat oven to 350 °. Remove strata from refrigerator while oven heats. Bake, uncovered, 20 minutes. Sprinkle with remaining cheese; top with reserved prosciutto. Bake 15-20 minutes longer or until a knife inserted near the center comes out clean. Let stand 5-10 minutes before serving.