Potato Turnip Mushroom Gratin - Walter Stewart's Market

Ingredients

• 4 cups thinly sliced peeled potatoes
• 4 cups thinly sliced peeled turnips
• 1 cup asiago cheese
• 1/2 cup low-fat organic milk
• 1 8-ounce pack Pacific Organic Vegetable Stock
• .5 ounce ( ~1/4 cup) dried mushrooms blend
• 1 1/2 teaspoon dried thyme
• salt and pepper to taste
• 1/2 cup non-fat Greek yogurt
• 1 egg, beaten
• 1 cup raw gruyere cheese, shredded