Krispy Sweet Corn Casserole

Ingredients

• 4 teaspoons cornstarch
• 2/3 cup water
• 1/4 cup butter, cubed, plus 3 tablespoons butter, melted, divided
• 3 cups fresh or frozen corn
• 1 (5-ounce) can evaporated milk
• 3/4 teaspoon plus 1 1/2 teaspoons sugar, divided
• 1/2 teaspoon plus 3/4 teaspoon salt, divided
• 3 large eggs
• 3/4 cup 2% milk
• 1/4 teaspoon pepper
• 3 cups bread, cubed
• 1 small onion, chopped
• 1 cup rice cereal, slightly crushed
• 3 tablespoons butter, melted