French Toast Strata

Ingredients

• 12 loaf French bread or 12 loaf Italian bread (1-pound)
• 2 tablespoons butter or 2 tablespoons margarine
• 1 large cooking apple, peeled and coarsely chopped
• 12 cup seedless raisin
• 12 cup coarsely chopped walnuts
• 14 cup granulated sugar
• 12 teaspoon ground cinnamon
• 14 teaspoon ground nutmeg
• 1 cup sour cream, divided
• 6 eggs
• 1 12 cups milk
• 14 cup maple syrup