Place the olive oil, ground round, chopped onion, and chopped celery in a large skillet. Cook over medium heat until the ground round is cooked through, about 7 minutes.
Add the beef stock, tomato paste, ketchup, brown sugar, garlic powder, salt, and pepper to the skillet. Stir to combine.
Add the gluten free rotini and stir to make sure all the pasta is covered with liquid.
Bring to a boil, then reduce the heat to medium and simmer for about 20 minutes, until the pasta is tender. The amount of time may vary depending on the brand of pasta that you use.
Taste, and season with more salt and pepper if needed. Top with fresh herbs if desired.
Notes
Store leftovers in the refrigerator in a sealed container. They should stay fresh for about 3-4 days.If you find that the leftovers are a little dry, just add a bit of water before reheating. Sometimes gluten free pasta can really absorb liquid.