Make the brownies

• Preheat the oven to 325 degrees. Grease and line an 8 inch round baking pan with parchment paper. Get out your scale to measure the ingredients!
• Melt the butter in a large saucepan over medium heat. Take the pan off the heat and add the sugar and cocoa, stirring until there are no lumps.
• Add vanilla, salt and egg whites and stir again until everything is combined.
• Finally add the spelt flour, stir until combined then continue beating for about 30 seconds until the mixture comes together in a smooth, shiny batter.
• Pour into the baking pan.
• Slice large marshmallows in halves and gently place into the batter in whichever pattern you like.
• Bake for 25 minutes in the middle rack of your oven.
• Carefully under watchful eye, set the oven to broil, move the pan to the top rack and allow the marshmallows to get extra toasty, about 30 seconds, being careful not to burn.
• Cool in the pan, then slice into pie wedges.