Heat the olive oil in a large skillet over medium heat.
Add the sliced chicken sausage to the skillet and cook until browned, about 5-7 minutes.
Stir in the diced onion and cook for 3-4 minutes until softened.
Add the minced garlic and red pepper flakes, then cook for another minute until fragrant.
Add the broccoli florets and mix well, sautéing for 2-3 minutes.
Stir in the orzo and cook for another minute before adding the chicken broth.
Pour in the chicken broth and bring the mixture to a boil.
Cover and let it simmer for about 10-12 minutes, or until the orzo is tender.
Adjust seasoning with salt and pepper to taste.
Serve hot, topped with grated Parmesan cheese.