Cook the sausage, slice and keep it warm

Cook the pasta in a large pot of boiling salted water

While pasta is cooking,add the olive oil and butter to a large pan

Add garlic and salt, and cook the garlic on medium heat until tender

Reduce heat to low and add the milk and cream, stirring gently

Add the cheese, pumpkin, cinnamon, nutmeg and rosemary

Stir until all ingredients are combined and heated through

Add the cooked sausage

When pasta is just al dente, remove from the pot and add to the sauce mixture

Gently mix everything together and serve immediately