Bring a large pot of salted water to a boil and cook the frozen ravioli according to package instructions; reserve 1/2 cup of the pasta cooking water, then drain and set ravioli aside.
Heat 2 tablespoons olive oil in a large 12" skillet over medium-high heat.
Add the bite-size chicken pieces to the hot skillet and season with salt, pepper, 1 teaspoon garlic powder, 1 teaspoon Italian seasoning, and 1/2 teaspoon red pepper flakes; cook, stirring occasionally, until browned and cooked through, about 5–7 minutes.
Add the minced garlic, chopped sun-dried tomatoes, chopped green onions, and chopped parsley; sauté for about 2 minutes until fragrant.
Pour in 1 cup heavy cream and 1/2 cup chicken broth, bring to a gentle simmer, and cook 2–3 minutes to combine flavors and slightly thicken the sauce.
Add the cooked ravioli and 1 cup grated Parmesan to the skillet; gently toss to coat, adding reserved pasta water a tablespoon at a time if the sauce is too thick.
Adjust seasoning to taste and serve immediately with extra Parmesan if desired.