Combine 2 cups of frozen berries in a small saucepan over low to medium heat. Stir gently every couple of minutes for about 5-7 minutes until the berries begin releasing their juices.

Remove from heat and mash the berries with a fork or potato masher to reach your desired consistency.

Stir in 2 tablespoons of chia seeds and add maple syrup if desired. Mix thoroughly.

Let the mixture sit for 5-10 minutes to thicken as the chia seeds absorb moisture.

Transfer to a sealed container or mason jar and cool completely before refrigerating.