Nourish PA: Potato and Mushroom Gratin

Ingredients

• 1 (10.5-ounce) can cream of mushroom soup
• 1 cup milk, dairy or non-dairy
• 1 teaspoon garlic powder or onion powder, optional
• 1/2 teaspoon each salt and pepper
• 4 large potatoes such as, russet, golden or red, peeled and thinly sliced
• 1 (8-ounce) package mushrooms, such as cremini or white button, cleaned and sliced
• 1 cup shredded mozzarella cheese
• 2 teaspoons chopped fresh parsley, or 1 teaspoon dried parsley (optional)