Italian Ground Beef Casserole with Biscuit Topping

Ingredients

• 1 lb ground beef
• ¾ cup water
• 1½ cups frozen peas, carrots and corn (or any mixed vegetables), thawed
• ½ teaspoon dried oregano, crushed
• 1 (8 oz) can tomato sauce
• 1 (6 oz) can tomato paste
• 2 cups (8 oz) shredded mozzarella cheese
• 1 (16 oz) can refrigerated flaky layer biscuits
• salt and pepper
• 1 tablespoon butter, melted
• ½ cup chopped onion