In a large bowl, whisk together the gluten-free oats, oat milk, applesauce, and peanut butter powder until well combined.
Gently fold in the sliced strawberries.
Divide the mixture evenly among four mason jars or other airtight containers.
Cover and refrigerate overnight, or for at least 6-8 hours, to allow the oats to soften.
In the morning, remove from the refrigerator and enjoy! Top with additional fresh fruit, nuts, seeds, or a drizzle of honey or maple syrup, if desired.