Bring a large pot of salted water to a boil and cook tortellini according to package instructions until al dente; drain and set aside.
In a medium bowl, toss chicken cubes with garlic powder, onion powder, salt, and pepper.
Heat olive oil in a large skillet over medium-high heat and sauté chicken until browned and the internal temperature reaches 165°F.
Remove chicken from the skillet and set aside on a plate.
Lower heat to medium and pour heavy cream and buffalo sauce into the same skillet, whisking to combine and scraping up any browned bits.
Simmer the sauce for 5 minutes until slightly thickened, then whisk in the Parmesan cheese until melted and smooth.
Add the cooked tortellini and chicken back into the skillet and toss until thoroughly coated in the sauce.
Garnish with sliced green onions and blue cheese crumbles before serving.