Make the honey mustard sauce: Combine the mustard, honey and soy sauce in a mixing bowl and whisk well until smooth. Set aside.
Place the chicken in the baking pan and season on both sides with salt and pepper.
On the stove, Heat a saute pan on medium-high heat. Add the oil and heat for a minute or two.
When the pan is hot, sear the chicken until golden brown. Flip and sear on the other side. About 3 minutes on each side.
Transfer the chicken back to the baking pan and cover generously with the honey mustard sauce. (reserve some of the sauce on the side if desired)
Place the pan in the oven and finish cooking the chicken until cooked through, about 10-12 minutes. (Check with a meat thermometer if desired. Chicken should be cooked to an internal temperature of 165 degrees.)
Remove, and enjoy right away whole or let sit for a couple minutes before slicing. (For slicing: Using a chef’s knife, make even cuts on a bias.)
Top with the remaining sauce left in the baking pan and enjoy!