Blueberry Bliss French Toast Casserole

Ingredients

• 1/2 cup granulated sugar
• 6 large eggs
• nonstick cooking spray
• 1/2 tsp ground nutmeg
• maple syrup for serving
• 1 tsp pure vanilla extract
• 1 tsp ground cinnamon
• powdered sugar for dusting (optional)
• 3 cups fresh blueberries
• 1 lb bakery white bread, cut into 1.5-inch cubes
• 3 cups whole milk