01 -
Heat oven to 350°F and line trays with parchment paper.
02 -
Stir salt, baking powder, cocoa, and flour together in a bowl.
03 -
Melt butter and chocolate in the microwave, stirring every 30 seconds until smooth.
04 -
Whisk sugar and eggs on high for 5 minutes until thick and pale in color.
05 -
Gently fold chocolate mix and vanilla into eggs, then carefully add the dry ingredients.
06 -
Put the batter in the fridge for 15 minutes so it thickens up.
07 -
Portion and bake in batches for 10-12 minutes, until the tops crack and look shiny.