Use old-fashioned rolled oats for best texture. Stir cocoa thoroughly to prevent clumping. Soak at least 4 hours or overnight. If too thick, add 1–2 tablespoons milk before serving. If too thin, add 1 teaspoon chia seeds and refrigerate 30 more minutes. Store in airtight jars up to 4 days. Freezing is not recommended as it alters texture.