Pour rice krispies into a large bowl, and pour honey, peanut butter, protein powder, and salt into bowl with the rice cereal.
Spray a spatula with non-stick spray, (this will make it so the batter doesn't stick to the spatula), and stir until everything is well combined.
Spoon batter into the prepared baking dish, and spread batter evenly into pan with the spatula.
If using chocolate, melt chocolate in a microwave safe bowl for 30 second intervals, stirring in between, until chocolate is melted. (Be careful not to over-microwave, or chocolate will burn). Pour the melted chocolate over the batter and spread evenly.
Place rice krispy treats in the freezer for about 30 minutes, until they firm up, and move them to the fridge. Keep rice krispie treats stored in the fridge to keep them at the perfect 'firm' texture! (Note: You could also cut them into squares, and wrap them individually, and put them back in the freezer for a quick healthy treat that is ready when you are!)