Measure cereal and place in a large bowl; set aside.
Pour powdered sugar, protein powder, collagen peptides, and graham cracker crumbs into a gallon sized resealable ziplock bag; seal and shake to combine.
In a microwave safe bowl, add chocolate chips and coconut oil and microwave for 2 minutes, stirring halfway through.
Stir until chocolate chips have melted and the mixture is smooth.
Pour chocolate mixture over cereal and toss until evenly coated.
Carefully pour coated cereal mixture into the bag, seal and shake until well coated.
Add marshmallow bits then seal and shake to combine.