Chop garlic into small pieces, slice mushrooms and onion.

Cook spaghetti according to packaging instructions.

Melt butter on a pan and lightly fry garlic and onions for 2 minutes.

Pour shredded Havarti and cream into the pan together with onions and cook for 5 minutes.

Mix the mushrooms into the sauce, together with salt and pepper.

Serve on a plate spaghetti and sauce, top with cut green onions and basil.