Mediterranean Spinach Strata

Ingredients

• 1 ½ teaspoons dried oregano
• 3 cups fat-free milk
• 3 cups thinly sliced plum tomato (about 1 pound)
• 4 large egg whites, lightly beaten
• 2 (8-ounce) loaves French bread baguette, cut into 1-inch-thick slices
• Cooking spray
• 1 cup chopped onion
• + 10 more ingredients
• • 4 garlic cloves, minced
  • 1 (8-ounce) package presliced mushrooms
  • 1 tablespoon all-purpose flour
  • ½ teaspoon black pepper, divided
  • 5 large eggs, lightly beaten
  • 1 (4-ounce) package crumbled feta cheese
  • ¾ cup (3 ounces) grated Asiago cheese, divided
  • 2 (7-ounce) bags baby spinach
  • 2 tablespoons Dijon mustard
  • ½ teaspoon salt, divided

Preheat oven to 350°. Place bread slices in a single layer on a baking sheet. Bake at 350° for 12 minutes or until lightly browned. Heat a large nonstick skillet coated with cooking spray over medium-high heat. Add onion, garlic, and mushrooms; sauté 5 minutes or until tender. Sprinkle flour over...

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