On a flat surface, place 4 bowls or lidded glass jars. Fill each with 1 teaspoon ground flax, ½ cup oats, ¾ cup milk, and ½ tablespoon maple syrup. Using a spoon, mix to combine.
Top each oat mixture with banana slices, then strawberry slices, and a tablespoon of chocolate chips.
Refrigerate for 8 hours or overnight.
When ready to eat, serve cold or warm up for 30 seconds in the microwave.