Add 1 cup unsweetened plant based milk and 2 tablespoons chia seeds to a container with lid, like a small mason jar. Stir well to mix. Chill to set, at least 4 hours. Stir well before serving.
Thaw frozen berries for a minute in the microwave. Set aside at room temperature.
Place frozen fruit into a blender. Blend until almost smooth.
Pour chia seed mixture into an 8 ounce bowl or glass. Stir well to mix.
Pour 1/2 cup berries onto the centre of each pudding. Serve with trail mix for topping. Serve chilled.