Preheat oven to 350 degrees. Melt butter in a medium saucepan and dissolve cocoa in the butter, set aside. Beat eggs and sugar together until fluffy. Beat in flour, salt and vanilla. Slowly add the chocolate mixture, stir well. Stir in pecans, chocolate chips and brickle chips. Pour mixture into a greased and floured 9 x 13 inch pan. Bake for 30 minutes.