Cook the pasta according to package instructions until al dente, then drain and set aside.

In a large skillet, melt 2 tablespoons of butter over medium heat. Add the sliced mushrooms and cook for 8-10 minutes until tender and browned.

Transfer cooked mushrooms to a small bowl and tent to keep warm.

In the same skillet, add diced onions and minced garlic. Cook for 3-5 minutes until onions are softened.

Add ground beef, Worcestershire sauce, seasoned salt, and hamburger seasoning. Cook for 8-10 minutes until beef is cooked through. Drain excess grease.

Stir in the cooked mushrooms and remove from heat.

Prepare the cheese sauce: In a saucepan, melt 0.5 cup butter over medium heat. Whisk in flour and cook for 1-2 minutes.

Gradually pour in the milk, whisking constantly until mixture thickens, about 3-5 minutes.

Add garlic powder, then stir in Swiss and mozzarella cheeses until melted.

Combine the cooked pasta, beef mixture, and cheese sauce. Mix well, season with salt and pepper to taste, and serve immediately.