Preheat your oven to 350 degrees.

Mix together the melted butter and cocoa powder.

Add in the sugar and stir to combine.

Add eggs, 1 at a time, and stir until well incorporated.

Add in the vanilla, flour and salt and stir until the flour is fully incorporated.

Pour into a well greased 8” x 8” pan, and bake for 25 minutes.

I used Pyrex baking dish, and the 25 minute baking time was perfect, but it may need to be adjusted for a metal baking pan.