SAUTÉ: Heat oil on medium heat in a medium or large saucepan. Add onions and sauté for 3 minutes until translucent. Stir in garlic and cranberries. Sauté 1 minute.
SIMMER PEACH CHUTNEY: Add chopped peaches and remaining chutney ingredients except orange zest. Stir with a wooden spoon to combine. Bring to boil, then cover and lower heat to medium-low. Simmer for 10 minutes or until peaches are tender.
THICKEN AND FINISH: Uncover, increase heat to medium-high heat and let cook, stirring occasionally, for about 5-7 minutes until most of juices absorb and mixture thickens enough to coat the back of a spoon (it will thicken more when it cools and in fridge). Taste and adjust seasonings as needed. Add orange or lemon zest if desired (I do).
