Boil the macaroni in a large pot of well salted water until almost tender. Drain.
While the pasta drains, put the pot back on low heat. Add the butter. Once the butter is melted, whisk in the onion powder, mustard powder and turmeric. Cook for 15 seconds.
Whisk in the heavy cream. Add the cheddar cheese.
Turn the heat up to medium. Switch to a silicone spatula and stir the mixture until the cheese melts into the sauce.
Add the pasta to the sauce. Stir for about 1 minute until the sauce thickens to your liking.