Layer bread, sausage and spinach in an 8-inch baking dish. In a medium bowl, whisk together eggs, milk, garlic, salt, pepper and sage then pour over contents in baking dish. Sprinkle with cheese, cover and chill for at least 2 hours, or preferably overnight.
Preheat oven to 350°F. Uncover dish and bake until cooked through and golden brown, 50 to 60 minutes. Set aside to let rest for 10 minutes then serve.
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