Bring a large pot of salted water to a boil and cook rotini according to package directions until al dente.
Season chicken cubes evenly with Italian seasoning, salt, and black pepper.
In a large skillet, heat olive oil over medium-high heat. Add chicken cubes in a single layer and sear until golden brown and cooked through, approximately 5 to 7 minutes. Remove chicken from skillet and set aside.
In the same skillet, melt butter over medium heat. Add minced garlic and sauté for 60 seconds until fragrant but not browned.
Pour in heavy cream and chicken broth, whisking to deglaze the bottom of the pan. Bring to a light simmer.
Whisk in Parmesan cheese continuously until the cheese is melted and the sauce begins to thicken.
Transfer the cooked pasta and chicken bites into the skillet. Toss thoroughly to ensure the sauce coats all ingredients evenly.
Remove from heat and garnish with chopped fresh parsley before serving.