1/2 c. butter
3/4 c. brown sugar
2 eggs, lightly beaten
1 tsp. vanilla
1/2 c. all-purpose flour
1 c. semi-sweet chocolate chips
1 tsp. baking powder
Confectioners sugar or instant cocoa drink mix

Place butter in 2-quart glass measure or micro-proof bowl. Cook on High for 1 minute, or until melted. Stir in brown sugar, eggs and vanilla. Stir in remaining ingredients, except confectioners sugar. Spread in 9-inch square micro-proof baking dish. Cook on High for 7 to 8 minutes, rotating dish if mixture is cooking unevenly. Let stand in pan to cool. Sprinkle with confectioners sugar or instant cocoa drink mix. Cut into squares.