Line an 8×8 pan with parchment paper or foil; set aside.
In a medium saucepan, heat the peanut butter, honey, and protein powder (optional) over medium heat until melted and well combined.
Remove from the heat and stir in the Cheerios.
Place the mixture into your prepared pan and press into place.
Sprinkle the top with mini chocolate chips (optional)
Cover and refrigerate for at least 1 hour before cutting.