Add frozen berries to a microwave safe dish and cover with a paper towel. Microwave on high for 1-2 minutes or until berries can be partially mashed with the back of a spoon. Mash and add to the bottom of a resealable container or jar.
Whisk almond milk and whey protein until smooth. Add rolled oats, chia seeds, and vanilla extract and mix until combined.
Divide the Greek yogurt evenly between the two jars, layering directly on top of the berries.
Top the yogurt and berries with the oat mixture. Refrigerate overnight.