Use old-fashioned rolled oats for best texture. Soak at least 4 hours, ideally overnight (8 hours). If too thick, stir in 1–3 tablespoons milk before serving. If too runny, add 1 teaspoon chia seeds and chill 30 minutes. Add fresh toppings just before serving. Store in airtight jars up to 4 days at 40°F or below.