In a large bowl, combine olive oil, lemon juice, red wine vinegar, garlic, Greek yogurt, paprika, oregano, salt, and pepper. Mix until fully combined.
Slice the chicken breasts horizontally so they are thinner and cook evenly. Add the chicken to the marinade and coat well. Marinate for at least 15 minutes, or longer if time allows.
Spray a loaf pan with avocado oil and transfer the marinated chicken into the pan, layering evenly. Pour any remaining marinade over the top and drizzle with melted butter.
Bake at 425°F for approximately one hour, or until a meat thermometer reads 165°F internal temperature. Let the chicken rest for several minutes, then slice thin.