1 (16 oz.) package frozen chopped spinach (or 2 10-oz. packages), thawed and excess water squeezed out 1 Tbsp. butter 1 large onion, chopped 1 tsp. salt ½ tsp. freshly ground black pepper ¼ tsp. nutmeg 8 cups whole wheat bread, cubed (a thick hearty loaf like sourdough) 1 lb. sweet Italian pork sausage (optional) 6 oz. (2 cups) Gruyere, grated 2 oz. (1 cup) Parmigiano Reggiano, grated 2¾ cup milk 9 large eggs 2 Tbsp. Dijon Mustard (or whole grain mustard)

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