Start by lining a baking dish with parchment paper or aluminum foil. This will make it easier to remove the bars once they are set.
In a mixing bowl, combine the vanilla protein powder and peanut butter. Using a spatula or your hands, mix the ingredients until well combined and a thick dough-like consistency is formed. The dough should hold together when pressed but still be slightly sticky.
Transfer the dough to the prepared baking dish and press it down firmly and evenly using your hands or the back of a spoon. Make sure to spread the dough out to the edges of the dish to create a uniform thickness.
Melt the dark chocolate chips in a microwave-safe bowl or using a double boiler. Stir the chocolate until smooth and creamy.
Pour the melted chocolate over the pressed dough and spread it evenly using a spatula or the back of a spoon. Make sure to cover the entire surface of the bars with the chocolate layer.
Place the baking dish in the refrigerator or freezer to allow the bars to set. This usually takes around 1-2 hours in the refrigerator or 30-60 minutes in the freezer.
Once the bars are firm and set, remove them from the baking dish by lifting the edges of the parchment paper or foil. Place the bars on a cutting board and use a sharp knife to slice them into individual bars or squares.
Store the peanut butter protein bars in an airtight container in the refrigerator or the freezer.
Enjoy them as a quick snack or a post-workout treat whenever you need a boost of energy!