In a bowl, mix the oats (or almond flour), protein powder, and chosen sweetener.
Add the nut butter and milk; stir until you get a soft cookie-dough consistency. Then fold in the mini chocolate chips.
Evenly press this dough into silicone muffin cups or paper liners — this will be the base.
In another bowl, whisk the Greek yogurt (optionally add a small scoop of protein powder if you like) until smooth, sweetening to taste.
Spoon the yogurt mixture over each cookie-dough base. Optionally, top with more chocolate chips or a drizzle of nut butter.
Chill in the refrigerator for 1–2 hours or freeze for 20–30 minutes until firm.
Once set, remove from molds and enjoy chilled.