Broccoli, Mushroom, and Cheese Breakfast Strata

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4 teaspoons olive oil

1 large onion, diced (about 2 cups)

3 garlic cloves, minced

3 cups (8 ounces) sliced mushrooms

Nonstick cooking spray

1 whole wheat baguette, crusts removed, cubed (about 5 cups)

8 eggs and 8 egg whites

2 cups low-fat milk

1 tablespoon Dijon mustard

10 ounces broccoli, steamed, cooled and chopped (or frozen, thawed)

1-ounce (1/3 cup) grated Parmesan

4-ounce (1 cup) part-skim mozzarella cheese

1/2 cup thinly sliced sun-dried tomatoes, reconstituted

1 tablespoon minced fresh thyme leaves

1/2 teaspoon salt

1/2 teaspoon freshly ground pepper