Combine almond milk, bananas, oats, water, chia seeds, and cinnamon in a jar or airtight container; stir together. Cover and refrigerate, 8 hours to overnight.
Place oat mixture in a saucepan over low heat and gently cook for about 5 minutes. Divide between 2 bowls and top with blueberries, blackberries, and nectarine.
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