Butter a large deep baking dish using a little butter and moving it around with your hands.
Place potatoes and baby carrots without peeling on the pan making sure they are well spread out and not one on top of the other. Leave space for the chicken pieces.
Place the chicken directly on the pan, not on top of the vegetables.
In a small bowl, mix together honey and mustard and then evenly pour over chicken and vegetables.
Cut butter into pieces and place pieces on chicken and vegetables.
Bake for 50-60 minutes or until potatoes are cooked through.