Drizzle and heat oil in an oven safe skillet on medium heat. Add chicken breasts. After 5 minutes, turn and cook for another 5 minutes.
Place skillet in a 375° oven for 30 minutes.
Make marinade by adding butter, marmalade, zest, red pepper flakes, salt & pepper to a non-stick saucepan over medium heat. Stir until well combined.
After 30 minutes, remove skillet from oven, brush both sides of each piece of chicken with orange glaze, and place back in the oven for another 10 minutes, or until the internal temperature reaches 165°. Remove from oven and place chicken on a cutting board to rest.
Add remaining orange glaze to the skillet over medium heat with 2 tbsp butter and chicken broth, stirring to deglaze the pan well until it just starts to bubble.
Drizzle sauce on chicken and serve.