Blueberry Pancake Casserole

Name: Blueberry Pancake Casserole
Ingredients: 2 1/2 cups all-purpose flour, divided; 2 tablespoons granulated sugar; 1/2 teaspoon kosher salt; 2 large eggs, lightly beaten; 2 cups buttermilk; 1/2 cup whole or 2% milk; 4 tablespoons (1/2 stick) unsalted butter, melted and cooled; Finely grated zest from 1 medium lemon; 1 tablespoon freshly squeezed lemon juice; Cooking spray; 1 teaspoon baking powder; 1 teaspoon baking soda; 1 1/2 cups fresh blueberries; 1/2 cup all-purpose flour; 3 tablespoons packed brown sugar; 3 tablespoons granulated sugar; 1/2 teaspoon ground cinnamon; 1/4 teaspoon kosher salt; 4 tablespoons unsalted butter, cubed