Mix the dry base: In a jar or bowl, combine rolled oats, protein powder, chia seeds, cinnamon, and a small pinch of salt. Stir to distribute the protein powder so there are no clumps.
Add the wet ingredients: Pour in the milk, Greek yogurt, vanilla extract, and maple syrup. Stir thoroughly.
The mixture should look slightly loose—chia and oats will thicken it overnight.
Adjust sweetness and spice: Taste and add a little more maple or cinnamon if needed. If using butter extract or a dab of cream cheese, fold it in now.
Create the “cinnamon swirl” (optional but fun): In a small cup, mix 1 teaspoon cinnamon with 1 teaspoon maple syrup and a splash of water until syrupy. Spoon it on top and gently swirl with a knife.
Chill: Cover and refrigerate for at least 4 hours, preferably overnight, until thick and creamy.
Serve: In the morning, stir, add a spoonful of Greek yogurt as a “frosting,” sprinkle extra cinnamon, and top with nuts or raisins if you like.
Enjoy cold, or warm it gently in the microwave for 30–45 seconds.