Vegetables Mornay

Ingredients

• 6 to 8 medium carrots, sliced 1/4 inch thick -
• 1/4 cup water -
• 3 cups frozen chopped broccoli -
• 2-1/4 cups frozen cauliflowerets -
• 2 jars (4-1/2 ounces each) whole mushrooms, drained -
• 2 tablespoons cornstarch -
• 1 teaspoon salt -
• 1/4 teaspoon pepper -
• 1-1/2 cups whole milk -
• 1/2 cup butter, melted, divided -
• 1 cup shredded Swiss cheese -
• 2 tablespoons Parmesan cheese -
• 1/2 cup seasoned croutons -