Brown meat in a large electric skillet or on the stove with the oil over med-high heat

When the meat is nicely browned, add the onion, garlic, celery, carrot and mushrooms. Sauté until the mushrooms release their moisture and the onions are soft, 5 – 6 minutes. Season with salt and pepper.

Add the flour, cook for a minute and then add beef broth and bring to a boil. Simmer 1 ¹⁄₂ – 2 hours, uncovered, adding more broth or water to keep the meat covered at all times.

Right before serving, adjust seasonings and fold in yogurt.