Preheat oven to 425 degrees.
Rinse chicken under cold water and remove everything from the cavity of the chicken.
In a small bowl, combine Mrs. Dash seasoning, poultry seasoning, and onion powder.
Generously season the chicken with the seasoning rub.
Cut the medium lemon into halves (or quarterand stuff inside the cavity of the chicken.
Next, chop all potatoes, red onions, carrots, and sweet red peppers.
In a baking pan, combine all vegetables with olive oil, Mrs. Dash seasoning, dill weed, and dried parsley. Mix until veggies are well-coated.
Place chicken on baking rack over vegetables. Make sure to pat the seasonings in to really secure that flavor to the chicken!
Roast the chicken for about 30 minutes. Remove from the oven and pour melted butter (or margarinover chicken.
Put the chicken back in the oven for about an hour. Roast until the juices run clear when you cut between the leg and thigh of the chicken.
Let rest for about 20 minutes, covered with aluminum foil, then serve with veggies and enjoy!