Preheat your oven to 350 F.

In a medium sized bowl, whisk together the egg, olive oil, coconut sugar and vanilla extract.

Mix in remaining dry ingredients and stir lightly until a dough forms. Fold in the chocolate chunks and marshmallows, reserving some to top.

Flatten the dough into a parchment lined 8 x 8 baking dish. Top with remaining chocolate and marshmallows.

Bake for 15-18 minutes, until the top begins to brown. 15 minutes will result in more of an underdone texture, so bake according to preference!

Let cool for 10 minutes before slicing. Top with flakey sea salt if desired

Keep stored in a sealed tight container for up to 1 week, or freeze for up to two months.