Preheat the oven to 375 degrees.

Quarter two sweet onions and place in the bottom of a large casserole dish or cast iron skillet reserving one or two quarters for stuffing inside the chicken.

Pat the chicken dry, remove the innards and put one or two onion quarters inside . Truss the chicken, and set on top of the onions.

Melt butter in a saucepan and whisk in the maple extract, honey, apple cider vinegar, and salt. 

Brush the mixture over the entire chicken. Once the whole bird is covered in maple butter, pour the rest on top of the chicken. Place in the preheated oven bake for 30 minutes for each pound of chicken. Baste and rotate the chicken every 30 minutes. Chicken is done once it registers 165 degrees on a meat thermometer. Begin checking internal temperature after 1.5 hours. Cover with foil once the skin reaches your desired browned color. Let rest for 10 minutes before serving.