Whisk almond milk, PB2, and collagen until smooth. Pour evenly into 4 containers.
Add 1/3 cup rolled oats to each of the 4 containers and mix until oats are submerged in liquid.
Place strawberries in a microwave safe bowl. Microwave for 1 minute at a time until strawberries can be mashed to a chunky consistency. Mix in chia seeds.
Divide strawberry mixture evenly into the 4 containers of oats. Refrigerate overnight before serving.