Dissolve olive oil and butter in a large non stick pan over high heat.
Pad the chicken fillets with flour and place into the hot pan. Cook one side till brown, then turn. Add feta cheese and allow to begin to melt. Once feta starts to melt, add heavy cream and lower the cooking temperature to medium.
Add squeezed lemon juice, oregano, and pepper. Allow to cook until cheese is melted and sauce is smooth. Remove when golden brown. Makes 4 servings. Enjoy!