Warm the liquid: In a small saucepan, add milk and water.
Bring to a gentle simmer over medium heat.
Add oats and salt: Stir in oats and a pinch of salt. Reduce heat to medium-low and cook, stirring occasionally, for 4–5 minutes until thickened.
Stir in blueberries: Add blueberries and cook 1–2 more minutes. They’ll start to burst and tint the oats a pretty purple.
Remove from heat and cool slightly: Take the pan off the heat and let it sit for 1 minute.
This helps prevent the protein powder from clumping.
Mix in protein and flavor: Whisk in protein powder, lemon zest, lemon juice, vanilla, and maple syrup or honey. If you’re using chia or flax, add it now.
Adjust consistency: If the oats are too thick, splash in a little extra milk and stir until creamy.
Finish and serve: Spoon into a bowl. Top with a dollop of Greek yogurt, extra blueberries, and a sprinkle of nuts if you like.