Bring a large pot of salted water to a boil and cook pasta according to package instructions until al dente.
Reserve 1/2 cup of pasta water, then drain the pasta.
Season the chicken cubes with salt and pepper.
Heat olive oil in a large skillet over medium-high heat. Add chicken and cook for 5-7 minutes until golden brown and internal temperature reaches 165°F (74°C). Remove chicken and set aside.
Reduce heat to medium. Add butter to the skillet and stir until melted. Add minced garlic and sauté for 60 seconds until fragrant.
Add the cooked pasta and chicken to the skillet. Toss well to coat.
Stir in Parmesan cheese and chopped parsley, adding reserved pasta water 1 tablespoon at a time to reach desired sauce consistency.