Cook the frozen ravioli according to package instructions; drain, reserving 1/2 cup of the pasta water, 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 skillet and season with salt, pepper, 1 teaspoon garlic powder, 1 teaspoon Italian seasoning, and 1/2 teaspoon red pepper flakes.
Sauté the chicken until browned and cooked through, about 5–7 minutes.
Add the minced garlic, chopped sun-dried tomatoes, chopped green onions, and chopped parsley to the skillet and cook, stirring, for 1–2 minutes.
Pour in 1 cup heavy cream and 1/2 cup chicken broth, stir to combine, and simmer for 2–3 minutes to thicken slightly.
Add the cooked ravioli and 1 cup grated Parmesan to the skillet and gently toss to coat in the sauce; add reserved pasta water a few tablespoons at a time if the sauce is too thick.
Cook for another 1–2 minutes to heat everything through, then serve immediately with additional Parmesan if desired.