This dish has fewer than 20g of total carbs--about half of what you'll find in classic bread-based casseroles. Greek yogurt, eggs, and cheese pack a mighty protein punch, while a touch of bacon seasons to perfection. The strata is best if allowed to soak overnight. Not only does this build in make-ahead convenience, it also allows the bread to fully absorb the egg mixture--yielding a creamy texture inside, while the top bread pieces get delightfully crisp.
4 center-cut bacon slices
1 1/2 cups chopped yellow onion (about 1 medium onion)
4 garlic cloves, thinly sliced
6 ounces fresh spinach, chopped
6 ounces crusty whole-grain bread, cut into 1-in. cubes
Cook bacon in a large skillet over medium until crisp, about 6 minutes. Transfer bacon to a paper towel-lined plate, reserving 1 1/2 tablespoons drippings in skillet; discard any remaining drippings. Finely chop bacon; set aside.
Add onion and garlic to drippings in skillet over medium-high heat; cook, stirring occasionally, until onion is browned and tender, about 10 minutes. Add spinach; cook until spinach wilts, about 2 minutes, stirring constantly. Toss together chopped bacon, onion mixture, bread cubes, and cheese in a large bowl. Arrange mixture evenly in an 8-inch square glass or ceramic baking dish coated with cooking spray.
Combine milk, yogurt, eggs, egg whites, mustard, pepper, and salt in a large bowl; stir with a whisk until well combined. Pour evenly over bread mixture. Cover and chill 8 hours or overnight.
Preheat oven to 350°F. Uncover baking dish; let strata stand at room temperature as oven preheats. Bake strata in preheated oven until top of strata is browned and a knife inserted in center comes out clean, about 1 hour. Let strata stand for 5 minutes before serving.
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