Flatten Chicken. Combine feta, lemon juice and oregano. Spread over Chicken. Fold Chicken to enclose filling; secure with a toothpick. Heat oil in a skillet until hot. Add Chicken and cook until golden brown. Mix chicken broth, tomato and spinach. Add to skillet, heat to boiling. Reduce heat to low; cover and simmer 8–10 minutes. Serve.