Baking

3 tablespoons unsalted butter 6 ounces Canadian bacon, cut into ½-inch pieces 1 small onion, finely chopped 1 garlic clove, minced 1 pound baby spinach (10 cups) Coarse salt and ground pepper 9 large eggs 3 cups whole milk ½ teaspoon ground nutmeg 8 cups 1½-to-2-inch cubes Italian bread (from a 1-pound loaf) 6 ounces Gruyere cheese, grated (about 1½ cups)

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