Use old fashioned rolled oats for best texture; avoid instant or steel-cut oats., Choose ripe, juicy peaches for best flavor; add extra sweetener if peaches are underripe., If fresh peaches brown after slicing, a squeeze of lemon juice keeps them fresh looking., Adjust thickness by varying milk; add yogurt for extra creaminess., Do not use more than 1 teaspoon chia seeds to avoid slimy texture., Use wide-mouth jars for easier mixing and topping., Peach overnight oats can be eaten cold or warmed in the microwave., Add-ins and variations include pecans, extra cinnamon, granola, Greek yogurt, protein powder, nut butters, frozen or canned peaches, other fruits like strawberries or apples, and alternative spices such as nutmeg or cardamom., Store in airtight container in fridge up to 5 days; best within 3 days for freshness., If oats thicken too much after storage, stir in milk to loosen before serving.