Preheat oven to 350°F. Grease a 9x13-inch baking dish.
Boil noodles in salted water until just tender, 5–6 minutes. Drain.
Warm oil in a large skillet over medium-high heat.
Add beef; cook, breaking it up, until browned. Drain excess fat.
Season with salt, pepper, garlic powder, onion powder, and thyme. Cook 1 minute.
Stir in both soups, beef broth, and Worcestershire. Simmer 3–4 minutes until slightly thickened.
Remove from heat; fold in sour cream and half the cheese.
Toss in noodles to coat evenly, then spread mixture in the baking dish.
Top with remaining cheese and most of the fried onions.
Bake 15 minutes. Add remaining onions; bake 5 minutes more until bubbly and golden.
Rest 5 minutes before serving.