Preheat oven to 350 degrees, and grease a 13 x 9 pan. Mix the
melted butter with brown sugar, and beat until smooth. Beat in
eggs and then vanilla. Add the salt, and stir in the flour and baking
powder. Mix in your additions (chocolate chips and graham cracker
crumbs). Pour into your prepared pan. Bake at 350 degrees for 20 -
25 minutes, or until the middle is set and a toothpick comes out
clean. Let cool completely before cutting.