Start with the dry base. In a jar or container, add oats, chia seeds, protein powder, and a pinch of salt.
Stir to combine so the protein powder doesn’t clump later.
Mix the wet ingredients. In a small bowl, whisk almond milk, Greek yogurt, vanilla extract, and maple syrup or honey (if using). Whisk until smooth.
Combine and stir. Pour the wet mixture over the dry ingredients. Stir well, scraping the corners and bottom so everything hydrates evenly.
Add the almond butter. Stir in the almond butter until streaks are mostly blended.
A few swirls are fine and add a nice texture.
Adjust the thickness. If it looks very thick, splash in extra almond milk. The mixture should be loose but not soupy; it will thicken overnight.
Seal and chill. Cover and refrigerate for at least 4 hours, ideally overnight, to let the oats soften and flavors meld.
Finish with crunch. In the morning, give it a good stir and top with sliced almonds. Add a drizzle of almond butter or a few berries if you like.