Preheat oven to 350.
Grease 8x8x2-inch pan.
Melt butter in medium saucepan.
Remove from heat, add cocoa and stir until well blended.
Add sugar and mix well.
Add eggs, one at a time, and beat well.
Stir in vanilla, flour and salt.
DO NOT OVERBEAT
Spread in pan and bake 25 to 30 minutes.
DO NOT OVERBAKE!!!