Preheat your oven to 350°F (175°C).
In a large skillet, heat the olive oil over medium heat. Add the sliced onions and cook, stirring occasionally, until they are golden brown and caramelized, about 20 minutes.
Add the ground beef to the skillet with the onions and cook until browned, breaking it up with a spoon as it cooks.
Ground beef and onions browning in skillet
Stir in the minced garlic, salt, pepper, and thyme. Cook for another minute until the garlic is fragrant.
Add the Worcestershire sauce and beef broth, stirring to combine. Bring the mixture to a simmer and let it cook for about 5 minutes.
Meanwhile, cook the pasta according to package instructions until al dente. Drain and set aside.
In a large casserole dish, combine the cooked pasta with the beef and onion mixture. Stir in the Swiss cheese.
Casserole dish filled before baking
Sprinkle the Parmesan cheese evenly over the top.
Bake in the preheated oven for 20-25 minutes, until the cheese is melted and bubbly.
Garnish with chopped parsley or fried French onions before serving.
Baked casserole fresh from the oven
Variations & Tips
For a different twist, try using Gruyère cheese instead of Swiss for a nuttier flavor. You can also add sliced mushrooms to the onion mixture for an earthy depth. If you prefer a bit of heat, a pinch of red pepper flakes can be added along with the garlic. For a lighter version, substitute ground turkey for the beef and use whole wheat pasta.
Served casserole portion on a supper plate
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