Add oats to container. Pour in milk, then arrange peaches over oats. Stir chia seeds and cinnamon into yogurt. Layer over peaches. Refrigerate overnight. Top with pecans and peach slices.
Gluten-free if made with Quaker Gluten Free Oats, vegetarian
For vegan version, substitute nondairy yogurt for Greek yogurt and nonfat milk for dairy alternative.