In a large bowl, combine the egg, oil, sugar, and vanilla extract. Whisk until smooth.
Add in the almond flour, tapioca flour, baking soda and salt and combine everything together using a rubber spatula.
Fold in the chocolate chips and the marshmallows.
Chill the batter for 1 hour.
After an hour, preheat the oven to 350 F.
Line a baking sheet with parchment paper and roll two tbsp worth of batter into a ball on the tray. You can press a few extra chocolate chips or marshmallow pieces into the tops of the dough.
Bake the cookies for 10-12 minutes, then let them cool completely.
Keep stored in an airtight container for up to 1 week, or freeze for up to 3 months.