Combine the gluten-free oats, Greek yogurt, chia seeds, protein powder, and almond milk in a bowl or jar. Mix thoroughly until well incorporated.

Stir in the honey or maple syrup, lemon zest, lemon juice, and vanilla extract until everything is blended seamlessly.

Cover the jar or bowl and refrigerate for at least 4 hours or overnight.

In the morning, stir the oats and add more milk if needed. Top with berries or nuts before serving.