Prepare the mini vegan marshmallows by placing them in an airtight container and freezing for a few hours.
Preheat your oven to 350°F (175°C).
In a medium-sized bowl, combine the gluten-free flour, baking soda, and sea salt. Whisk until well blended.
In a larger bowl, cream together the softened butter, granulated sugar, and brown sugar until fluffy. Add the creamy peanut butter, egg, and vanilla extract, mixing until fully combined.
Gently fold in the frozen mini vegan marshmallows into the batter.
Combine the wet and dry mixtures, stirring until a uniform batter forms without overmixing.
Scoop balls of dough onto a lined baking sheet, leaving space between each. Bake for 10-11 minutes or until golden brown.