Ingredients

• For the Filling

  • 1 tablespoon plus 1 teaspoon extra-virgin olive oil
  • 1 large onion, finely chopped (about 1 1/2 cups)
  • 3 celery stalks, finely chopped
  • 2 medium carrots, finely chopped
  • 2 garlic cloves, minced
  • 2 pounds lean ground turkey
  • Coarse salt and freshly ground pepper
  • 1 tablespoon fresh thyme
  • 3/4 teaspoon chipotle or regular chili powder
  • 2 tablespoons plus 1 1/2 teaspoons cornstarch
  • 6 ounces frozen peas (about 1 1/2 cups)

• For the Topping

  • 1 1/2 pounds russet potatoes, peeled and cut into 1-inch pieces
  • 3 parsnips (6 ounces), peeled and cut into 1/2-inch pieces
  • 1 cup plain fat-free yogurt
  • Coarse salt and freshly ground pepper