Preheat the oven to 400F.

Cook the pasta in boiling water until almost done, then drain and set aside. 

In a large skillet, melt some butter and add some sliced mushrooms. Sauté for 10 minutes, stirring occasionally. 

Use a slotted spoon to remove them from the skillet and set aside. Add some ground beef, and cook in the butter until browned. Drain any excess liquid, then return the skillet to the heat and add tomato sauce, garlic paste, onion powder, and Italian seasoning.

Cook over a medium heat for 10 minutes, stirring every now and then. Taste for seasoning, and add salt and pepper as desired. 

Transfer the meat sauce into a large bowl and add the mushrooms and pasta, then mix to combine.

Pour everything into a 9 x 13" baking dish and sprinkle some shredded cheese over the top, then bake in the oven for 10-15 minutes or until the cheese has melted.