Cook pasta according to package instructions. Drain and set aside.
Heat olive oil in a large skillet over medium heat. Add garlic and cook until fragrant.
Add diced chicken and stir until warmed through.
Pour in milk and stir. Add Parmesan cheese, Italian herbs, salt, and pepper.
Mix cornstarch slurry into the skillet and stir until the sauce thickens.
Add cooked pasta to the sauce and toss to coat evenly.
Serve warm, garnished with fresh parsley.