01 - Combine rolled oats, almond milk, chia seeds, maple syrup, and vanilla extract in a medium bowl or mason jar. Stir thoroughly until all ingredients are well incorporated.
02 - Gently fold mixed berries into the oat mixture, reserving a small portion for topping if desired.
03 - In a small separate bowl, mix almond butter with 2 tablespoons almond milk to achieve a smooth, pourable consistency.
04 - Distribute half the oat mixture evenly between two jars or bowls. Drizzle with prepared almond butter, then add remaining oat mixture on top.
05 - Cover containers and refrigerate overnight or for at least 4 hours, allowing oats and chia seeds to fully absorb liquid and soften.
06 - In the morning, stir thoroughly or maintain layered presentation. Top with reserved berries, sliced almonds, and additional almond butter or sweetener as desired. Serve chilled.