01 - Bring a large pot of salted water to a boil. Cook tortellini according to package instructions, adding broccoli florets during the last 2 minutes. Drain thoroughly and set aside.
02 - Pat chicken pieces dry and season all over with salt and freshly ground black pepper.
03 - Heat olive oil in a large skillet over medium-high heat. Add chicken and cook, stirring occasionally, until golden and fully cooked, about 5 to 6 minutes. Transfer chicken to a plate and set aside.
04 - In the same skillet, melt unsalted butter over medium heat. Add minced garlic and cook for 1 minute, stirring, until fragrant.
05 - Lower heat to medium and stir in heavy cream. Bring to a gentle simmer before adding grated Parmesan cheese. Cook, stirring, until cheese is melted and sauce thickens, about 2–3 minutes.
06 - Return chicken, tortellini, and broccoli to the skillet. Toss to evenly coat everything in the creamy sauce. Sprinkle in crushed red pepper flakes, if using.
07 - Taste and adjust seasoning with extra salt and pepper as needed.
08 - Plate hot and garnish with extra Parmesan and chopped fresh parsley, if desired.