Choose your container. Use a 12–16 oz jar or lidded container. This gives enough room to stir and for the oats to expand.
Mix the dry ingredients first. Add rolled oats, cocoa powder, protein powder, chia seeds, salt, and optional espresso powder to the container. Stir to evenly distribute the cocoa and protein powder so there are no clumps later.
Whisk the wet ingredients in a small bowl. Combine milk, Greek yogurt, vanilla, and sweetener.
Whisk until smooth and the yogurt is fully incorporated.
Combine and stir well. Pour the wet mixture over the dry ingredients. Stir thoroughly, scraping the bottom and sides, until no dry pockets remain. It should look slightly loose—that’s good.
Add chocolate chips last. Fold in mini chocolate chips or cacao nibs.
Save a few for topping if you like.
Adjust thickness. If it seems too thick, add a splash more milk. Remember, chia seeds and oats will thicken overnight.
Cover and chill. Seal the container and refrigerate for at least 4 hours, but overnight is best for perfect texture.
Stir and taste in the morning. Give it a good stir. If it’s too thick, loosen with more milk.
If you want more sweetness, add a small drizzle of maple syrup.
Top and serve. Finish with sliced banana, peanut butter, a sprinkle of flaky salt, extra chips, or berries. Enjoy cold, or warm gently in the microwave in 20–30 second bursts if you prefer.