Cut lemon in half, and squeeze juice from 1/2 lemon on chicken. Season with salt to taste. Let sit while you heat oil in a small skillet over medium low heat.
When oil is hot, put chicken in skillet. As you saute chicken, add juice from other 1/2 lemon, pepper to taste, and oregano. Saute for 5 to 10 minutes each side, or until juices run clear. Serve with parsley for garnish.