Put the cheerios in a large bowl. In a small pot, add the maple syrup and peanut butter. Heat over medium low heat and stir with a spatula continuously until nice and smooth. Remove from heat and add the salt and protein powder. Mix until well combined and smooth.
Pour mixture over the cheerios and stir until everything is well combined and evenly coated. Press the cheerios into a 9×9 pan (I lined mine with parchment paper). Make sure it is firmly packed in.
Melt the chocolate in 30 second increments in the microwave until melted and smooth. Make sure you stir the chocolate after each increment. I only microwaved mine for 1 minute total. Drizzle onto bars. Place in the freezer for 45-60 minutes to set. Slice and enjoy! Store in the freezer. You can eat these directly from the freezer. They don’t get super hard.