Place the chicken in a mixing bowl. Season lightly with salt and pepper and toss the chicken in the cornstarch to coat. Set aside.
Heat oil and butter in a large skillet over medium-high heat. Add the chicken, shaking off any excess cornstarch. Cook for 5-7 minutes or until the chicken is seared a golden brown and cooked through to an internal temperature of 165°F.
Add the remaining ingredients to the skillet and cook for 2-3 minutes, or until the sauce slightly thickens.
Remove the skillet from heat and garnish chicken with fresh parsley. Serve immediately, over rice if desired, and enjoy!
Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.