Sauce: prepare the honey mustard sauce by whisking ALL the ingredients for the sauce together in a small bowl and set aside.
Chicken: Melt Butter over medium-high in an iron (or oven safe) skillet and season the Chicken with Salt and Pepper on both sides. Place the chicken in the skillet and sear on each side for 3 minutes. Remove the chicken from the skillet and place on a plate (but only briefly). Pour the honey mustard sauce into the skillet and allow to bubble for 1 minute. Return the chicken to the skillet and spoon sauce over the chicken breasts.
Place the skillet in the oven and cook for 15 to 18 minutes or until the internal temp reaches 165 degrees.
Couscous: heat the olive oil over medium-high heat and add the minced garlic. Cook, stirring occasionally, until fragrant, about 1 minute. Add Water, Salt, and Pepper and bring to a boil. Add the Couscous and stir occasionally until all water is soaked up and the grains become fluffy. Serve with chicken.
Notes
The nutrition information includes the couscous. If you'd like to cut down on the calories then, swap this out for a vegetable such as broccoli.