INGREDIENTS
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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 3 ounces cave-aged Gruyère cheese, shredded (3/4