01 - In a mixing bowl, whisk together olive oil, lemon juice, lemon zest, minced garlic, Dijon mustard, honey, dried oregano, salt, and black pepper until fully combined.
02 - Place chicken breasts in a shallow dish and pour half of the marinade over them. Turn to coat evenly. Reserve the remaining marinade. Let the chicken rest for at least 10 minutes or up to 1 hour to deepen the flavor.
03 - Heat 1 tablespoon of butter in a large skillet over medium-high heat. Remove chicken from marinade, discarding marinade used for soaking. Sear chicken for 5 to 6 minutes on each side until golden and cooked through (internal temperature 165°F). Transfer chicken to a plate and loosely cover with foil to keep warm.
04 - Add the reserved marinade and chicken broth to the skillet. Bring to a gentle simmer, scraping the bottom to incorporate browned bits. Allow the sauce to reduce for 3 to 4 minutes until slightly thickened.
05 - Whisk in the remaining tablespoon of butter until melted and smooth. Return the chicken to the skillet, spoon sauce over each piece, and simmer for 1 minute to rewarm.
06 - Plate the chicken and drizzle with sauce. Garnish with chopped parsley and lemon slices before serving.