Preheat oven to 180c or 350f
Whisk the egg and granulated sweetener until doubled in size- can use a hand whisk or stand mixer etc (takes about 5 minutes)
Microwave the yogurt and almond milk for 30 seconds, add the vanilla and cocoa powder and mix well, let sit for a couple of minutes- this is not essential however it helps to bloom the cocoa powder which helps to intensify the chocolate flavor by releasing flavor that is trapped in the solid particles.
Add the yogurt cocoa powder mix to the whipped egg and whisk
Sift in the flour, baking soda and salt, and fold in chopped chocolate and biscuit crumbles
Once well combined, add the batter to a lined brownie pan
Bake at 180c or 350F for 15 minutes
Take out the brownie and top with mini marshmallows, extra chopped chocolate and the rest of the biscuit crumbles, put back into the oven for 3-5 minutes
Let the brownies cool down in the pan before cutting into 12 slices
