Add the butter and olive oil to a large pan over low/medium. Melt the butter.
Add the garlic and cook for 1 minute or until lightly golden.
Add the heavy cream a little bit at a time, fully incorporating it into the butter/olive oil/garlic each time.
Bring the sauce to a boil. Add the parmesan cheese and whisk until it's fully dissolved into the sauce.
Add the sage, thyme, nutmeg, white pepper, salt, and cinnamon. Combine.
Add the cup of pasta water that you have set aside to the sauce. Whisk it in.
Add the cooked gnocchi and let it cook for 1-2 minutes.