Cheesy Potato Gratin with Turkey Sausage and Mushrooms

Ingredients (10)

• 2 tablespoons olive oil
• 1/2 pound ground turkey OR turkey sausage removed from casings
• 2 yellow onions
• 2 cups sliced baby portobello mushrooms
• 3 garlic cloves
• 1 1/2 pounds small tri-colored potatoes
• 1/2 teaspoon dried thyme
• salt and fresh ground pepper
• 1/2 cup fat free low sodium chicken broth
• 1/2 cup shredded Italian cheese