FOR BROWNIE CUPCAKE: Preheat oven to 350 Pour box mix into large bowl, set aside. In separate bowl add eggs, oil, melted butter and milk. Stir to combine. Add mixture into bowl with brownie mix and stir until smooth. Take out cupcake pan and coat with a non-stick spray. Scoop 2 tbs. of mixture into each section then place into oven for about 20 minute
FOR CHOCOLATE GLAZE: While the brownies cook you should start on the glaze. Melt butter in medium sauce pan on low heat. While that melts in a small bowl add milk with the cocoa powder, stir & set aside. Once the butter is melted add your cocoa powder/milk mixture. Stir out clumps as the glaze thickens (Note: Watch carefully, it could burn!) Bring the liquid to a boil Add in the confectioners sugar while glaze is still hot to reduce clumping. Mix briskly or you'll have chunks Makes about 2 cups of glaze which is enough to cover 24 cupcakes if done right. If your glaze isn't smooth or has clumps of confectioners sugar, place it back on the burner at medium heat for just a few more minutes. Be sure to stir the the glaze the whole time.
FOR GLAZED CHOCOLATE BROWNIE CUPCAKES: Once the brownies are done, remove from pan onto a plate and place into the freezer for quicker cooling. If your glaze has been done for a little while you should re-heat it so its warm. After about 10 minutes check your brownies (they should be cool now.) Now take your warm glaze and thoroughly drizzle each cupcake. Serve still drippy or wait about 15 minutes for glaze to harden up .For best results take a tablespoon or so of glaze and pour right on top. If its warm enough it should trickle along the sides of the cupcake, covering the whole thing. Add more if necessary.