Prep Chicken: Cut chicken breasts into bite-sized pieces and, if needed, pat them dry with paper towel.
Coat Chicken: In a large, shallow bowl, whisk together cornstarch and salt, then gently toss chicken pieces in mixture until evenly coated.
Cook Chicken: Heat avocado oil in a skillet over medium heat. Once oil is hot and shimmering, add chicken pieces and cook without touching for 4 minutes. Flip chicken pieces one by one, then cook until temperature of chicken pieces reaches 165 degrees F, about another 3-5 minutes, stirring around occasionally to cook all sides.
Transfer To Plate: Remove chicken bites from pan and transfer to a paper towel-lined plate.
Prepare Garlic Butter: Melt butter in microwave or in small pan or pot on stovetop. Sprinkle spices in and stir until combined.
Coat Chicken: Toss chicken bites in garlic butter until coated evenly.
Garnish and Serve: Garnish chicken bites with a squeeze of fresh lemon juice and parsley, then serve.
