Line a 9 by 13 inch baking pan with parchment paper, include the sides. Butter the parchment.
In a large bowl, whisk together the flour, cocoa powder and salt. Using a double boiler, melt the butter and chocolate over simmering water. . Let it cool briefly then add the sugar gradually and eggs. Add the flour mixture. Stir nicely then pour the butter into the pan. Bake for 30 to 35 minutes.
Cool the brownies completely before slicing. Dust with confectioners sugar. Serve
Recipe by The Gluten Free at https://www.theglutenfree.com/gluten-free-classic-brownies/