Preheat the oven to 350 (high altitude 375)
Melt butter with unsweetened chocolate on top of a double boiler, stirring occasionally. Then set aside to cool.
Sift together cocoa, flour, baking powder, and salt.
Beat eggs until creamy, then gradually add sugar, beating constantly.
Add vanilla and cooled chocolate-butter mixture.
Stir in dry ingredients just until combined.
Spread batter in buttered 9X13 inch pan.
Sprinkle chocolate chips over the surface.
Bake for 30-35 minutes, or until the center no longer jiggles when shaken.
Cool, then cut into 32 pieces [32 pieces are tiny brownies, you cut them however large you want them!]