Preheat oven to 350°F (180°C). Grease a 13 x 9 x 2-inch baking pan. In large bowl, stir together butter, sugar, flour, cocoa, baking powder, eggs, milk and 1-1/2 teaspoons vanilla; beat well. Stir in nuts (if using). Spread batter into prepared pan. Bake 40 minutes or until brownies begin to pull away from sides of pan. Just before brownies are done, in heavy saucepan, melt chocolate chips with sweetened condensed milk and remaining 1-1/2 teaspoons vanilla. Immediately spread over hot brownies. Cool in pan on wire rack. Refrigerate. Cut into bars.
Makes about 36 brownies.
Date: April 3, 2004