Mediterranean Spinach Strata (Cooking Light)

• 2 (8 ounce) French baguettes, cut into 1-inch-thick slices
• cooking spray
• 1 cup chopped onion
• 4 garlic cloves, minced
• 1 (8 ounce) package presliced mushrooms
• 1 tablespoon all-purpose flour
• 2 (7 ounce) bags Baby Spinach
• 1/2 teaspoon salt, divided
• 1/2 teaspoon black pepper, divided
• 3 cups thinly sliced plum tomatoes (about 1 pound)
• 1 (4 ounce) package crumbled feta cheese
• 3/4 3/4 cup romano cheese, divided or 3/4 cup sharp provolone cheese, grated divided
• 3 cups nonfat milk
• 2 tablespoons Dijon mustard
• 1 1/2 teaspoons dried oregano
• 5 large eggs, lightly beaten
• 4 large egg whites, lightly beaten

1. Preheat oven to 350u0b0F Place bread slices in a single layer on a baking sheet. Bake at 350u0b0F for 12 minutes or until lightly browned.
2. Heat a large nonstick skillet coated with cooking spray over medium-high heat. Add onion, garlic, and mushrooms; saute 5 minutes or until tender. Sprinkle flour over mushroom mixture; cook 1 minute, stirring constantly. Add 1 bag of spinach; cook 3 minutes or until spinach wilts. Add remaining spinach; cook 3 minutes or until spinach wilts. Stir in 1/4 teaspoon salt and 1/4 teaspoon pepper.
3. Place half of bread slices in bottom of a 13 x 9-inch baking dish coated with cooking spray. Spread spinach mixture over bread. Top with tomato slices; sprinkle evenly with feta and half of Asiago cheese. Arrange remaining bread slices over cheese. Combine 1/4 teaspoon salt, 1/4 teaspoon pepper, milk, and remaining ingredients, stirring well with a whisk. Pour over bread; sprinkle with remaining Asiago cheese. Cover and chill 8 hours or overnight.
4. Preheat oven to 350u0b0F
5. Uncover strata; bake at 350u0b0F for 40 minutes or until lightly browned and set. Serve warm.

cooking spray, onion, garlic, mushrooms, flour, spinach, salt, black pepper, tomatoes, feta cheese, romano cheese, nonfat milk, mustard, oregano, eggs, egg whites

Taken from www.food.com/recipe/mediterranean-spinach-strata-cooking-light-335649 (may not work)