Bring a large pot of salted water to a boil. Cook rigatoni according to the package instructions until al dente. Drain and set aside.
In a large skillet over medium heat, melt butter with olive oil. Add diced chicken, season with salt, pepper, and garlic powder, and cook until browned and fully cooked through.
Add minced garlic and sauté for about 1 minute, just until fragrant (don’t burn it!).
Pour in the heavy cream and bring it to a gentle simmer, stirring to mix with the garlic.
Stir in parmesan cheese and keep stirring until the sauce thickens slightly.
Add the cooked rigatoni to the skillet and toss everything together until the pasta is fully coated in the sauce.
Serve hot, garnished with chopped fresh parsley.