Crunchy Garlicky Mashed Potatoes

3 cups water
1 cup milk
1 teaspoon salt
1/2 teaspoon minced garlic
3 cups instant mashed potato flakes
1/4 cup sour cream
1 (2.8 ounce) can French fried onions, crushed
1/4 cup grated Parmesan cheese

Spray a shallow 1 1/2-quart casserole with cooking spray.

In a saucepan bring water to a boil. Remove from heat and add the milk, salt and garlic; stir. Add the potato flakes and sour cream; mix well. Spoon potatoes into casserole. Sprinkle with onions and cheese. Broil 6 inches from heat source for 30 to 60 seconds until brown.