Meatloaf and Brown Gravy

Bahan-bahan (12 porsi)

• 1 tablespoon extra virgin olive oil
• 1 large yellow onion (chopped fine)
• 2 medium celery stalks (minced fine)
• 1 1/2 pounds 90% lean ground beef
• 1 1/2 pounds 93% lean ground turkey
• 1 tablespoon chopped parsley (plus more for garnish)
• 1 tablespoon chopped fresh thyme leaves
• 3 large eggs (lightly beaten)
• 1/2 cup fat free milk
• 4 teaspoons kosher salt
• 1 3/4 cups raw quick oats
• 1/4 cup all purpose or gluten-free flour
• 3 cups salted beef broth or stock
• 1 thyme sprig
• fresh black pepper (to taste)