Bagel French Toast Casserole

Name: Bagel French Toast Casserole
Prep time: 15 min
Cook time: 1 h 30 min
Total time: 1 h 45 min
Cuisine: American
Ingredients: ¼ cup unsalted butter (melted); 6 large eggs; 2 cups milk (2% or whole); ¼ cup maple syrup; ¼ cup brown sugar; 2 tsp vanilla extract; 1½ tsp ground cinnamon; ½ tsp ground cardamom; ¼ tsp ground nutmeg; 6 cinnamon raisin bagels (cut into 1” pieces (see note)); ½ cup all-purpose flour; ½ cup brown sugar; 1 tsp cinnamon; ½ cup unsalted butter (cold); 1 cup confectioner’s sugar; 2 Tbsp maple syrup; 2 Tbsp milk; assorted berries (for topping)