Preheat oven to 375 and line two cookie sheet with parchment paper
Combine butter, peanut butter, and sugar in a large bowl and mix with a hand mixer until smooth.
Fold in arrowroot, baking soda, flour, and salt. Mix till a dough is formed.
Fold in chex, chocolate, and peanut butter chips until evenly combined
Use a cookie scoop to scoop dough and roll into balls
Place on the cookie sheet about 2 in. apart and gently press down.
Bake for about 10-12 minutes depending on how gooey you want the center of the cookies and the edges are golden.
Once the cookies come out, tap the cookie sheet on the stove to flatten them.
Light dust with powdered sugar once the cookies are cooled and for serving
Store in an airtight container for 3-5 day. Microwave before serving to remelt the butter