Quarter the orange and add to a small saucepan (or just use the orange peel). Add cranberries (I had some frozen) and cinnamon sticks. Fill pan with water and and set on lowest burner setting. As the potpourri simmers, add water as necessary.
Do not allow the water to evaporate. I check the water and refill as necessary every time I use it. Potpourri will last several weeks, but you can add more ingredients to freshen the scent as necessary. This mixture will fill your house with the warmth of the holiday season!