Cinnamon Baked French Toast

INGREDIENTS

• 1 teaspoon ground cinnamon
• Freshly grated nutmeg
• 2 cups whole milk
• 1 loaf crusty sourdough or French bread
• 1/2 cup whipping (heavy) cream
• 1/2 cup all-purpose flour
• 1/4 teaspoon salt
• Special equipment: 9-by-13-inch baking pan
• 1 stick cold butter, cut into pieces, plus more for serving
• 1 cup fresh blueberries, for serving
• 2 tablespoons vanilla extract
• 8 whole eggs
• 1/2 cup firmly packed brown sugar
• 1/2 cup brown sugar
• Butter, for greasing
• 1/2 cup granulated sugar
• Warm pancake syrup, for serving