Preheat the oven to 400°F. Line a baking sheet with parchment paper.
In a large bowl, combine ground chicken, Parmesan cheese, breadcrumbs, egg, rosemary, garlic, salt, black pepper, and red pepper flakes. Mix until well combined.
Form the mixture into meatballs, about 1 inch in diameter, and place them on the prepared baking sheet. Drizzle olive oil over the meatballs.
Bake in the preheated oven for 20-25 minutes, or until the meatballs are cooked through and golden brown.
While the meatballs are baking, bring chicken broth to a boil in a medium saucepan. Add orzo, diced tomatoes, oregano, salt, and black pepper. Stir to combine.
Reduce heat to a simmer, cover, and cook for about 8-10 minutes, or until the orzo is tender and has absorbed most of the liquid.
Once the meatballs are done, serve them over the tomato orzo and garnish with fresh parsley.