Stir together Greek yogurt, peanut butter, honey, vanilla, protein powder, and cocoa powder until the mixture is completely smooth and creamy.
Mix in rolled oats until they’re fully coated and the mixture looks uniform.
Gently fold in chocolate chips, making sure they’re evenly distributed throughout.
Press the mixture firmly into a parchment-lined 8×8 inch pan. Chill for at least 2 hours until completely set, then cut into bars.