Baked Challah French Toast

Name: Baked Challah French Toast
Ingredients: 6 tablespoons packed brown sugar; 1 teaspoon ground cinnamon; 1/8 teaspoon ground cardamom; 1/8 teaspoon ground nutmeg; 1 cup whole milk; 2/3 cup part-skim or whole-milk ricotta cheese; 1 1/2 teaspoons vanilla extract; 1/2 teaspoon kosher salt; 6 large eggs; Grated zest and juice of 1 lemon; 4 tablespoons unsalted butter, melted; 12 thick slices (3/4 to 1 inch thick) day-old challah bread; 1 cup frozen blueberries; Confectioners’ sugar, for serving