Measure your base: Add 1/2 cup rolled oats and 1 teaspoon chia seeds to a jar or container with a lid.
Mix the creamy layer: In a bowl, whisk 1/2 cup Greek yogurt, 1/2–3/4 cup milk, 1 scoop (25–30 g) protein powder, 1/2 teaspoon vanilla, and a small pinch of salt.
Sweeten with 1–2 teaspoons maple syrup or honey if you like.
Combine: Pour the yogurt mixture over the oats and chia. Stir until everything is well combined and no dry pockets remain.
Add the “cookies” factor: Gently crush 1–2 chocolate sandwich cookies. Stir most of the crumbs into the oats, saving a little for topping.
For extra texture, fold in 1 teaspoon mini chocolate chips or cacao nibs.
Chill: Seal and refrigerate for at least 4 hours, preferably overnight. The oats will soften and the chia will thicken the mixture.
Finish and serve: In the morning, give it a quick stir. Adjust consistency with a splash of milk if it’s too thick.
Top with the reserved cookie crumbs and enjoy cold.