Preheat an 8-inch pot with a tight-fitting cover over moderate heat.

Add olive oil, chopped onion, and chopped garlic to the pot.

Sauté for 2-3 minutes, until the onion is translucent.

Add chicken broth to the pot and bring to a boil.

Stir in the orzo pasta and return to a boil.

Cover the pot and reduce heat to simmer.

Cook for 15 minutes, stirring occasionally, until the liquid is absorbed and the pasta is tender.

Stir in the grated Parmesan cheese.

Season with salt and pepper to taste.

Serve hot.