01 - Whisk together olive oil, lemon juice, lemon zest, garlic, Dijon mustard, honey, oregano, salt, and black pepper in a bowl.
02 - Place chicken breasts in a shallow dish and pour half the marinade over them, turning to coat evenly. Reserve the remaining marinade and marinate chicken for at least 10 minutes up to 1 hour.
03 - Heat 1 tablespoon of butter in a large skillet over medium-high heat. Remove chicken from marinade and discard used marinade. Cook chicken 5 to 6 minutes per side until golden brown and cooked through (internal temperature 165°F). Remove chicken and cover loosely with foil.
04 - Add reserved marinade and chicken broth to the skillet. Bring to a simmer while scraping browned bits from the pan. Simmer for 3 to 4 minutes until slightly reduced.
05 - Whisk in remaining butter to enrich the sauce. Return chicken to the skillet, spoon sauce over, and simmer for 1 minute to heat through.
06 - Plate chicken breasts topped with sauce and garnish with chopped parsley and lemon slices.