Turkey Meatloaf

INGREDIENTS

1 teaspoon olive oil
1 small onion, finely chopped
1 small carrot, finely chopped
1 small celery stalk, finely chopped
2 garlic cloves, peeled and finely chopped
¾ teaspoon kosher salt, divided
½ teaspoon freshly ground black pepper, divided
2 ounces baby bella or crimini mushrooms, chopped
1-1/2 cups old fashioned oats, divided
½ cup chicken broth, low sodium
2 large eggs, lightly beaten
1/3 cup ketchup
1 tablespoon tomato paste
1-1/3 pound ground turkey
1 tablespoon chopped fresh parsley
Nonstick cooking spray