Cut across the grain of the turkey breast into 1/2 inch thick slices. Pound turkey into 1/4 inch thickness. Beat or shake together the lemon juice, oil, salt, and pepper and marinate pounded turkey 30 - 60 minutes.
Combine flour, cheese, oregano, garlic and onion powder and coat turkey pieces generously. Heat butter and saute turkey 5 minutes each side, adding more butter if needed. Serve immediately.