Step 1

Heat oven to 350°F. In medium bowl, mix 1/2 cup brown sugar and the butter. Stir in 1 cup flour. Press in ungreased rectangular pan, 13x9x2 inches. Bake 10 minutes.

Step 2

Meanwhile, in medium bowl, mix eggs, 1 cup brown sugar and the vanilla. Stir in 2 tablespoons flour, the baking powder and salt. Stir in semisweet and milk chocolate chips. Spread over crust.

Step 3

Bake bars 15 to 20 minutes or until golden brown. Cool completely in pan on wire rack.

Step 4

In 1-quart saucepan, heat all Chocolate Glaze ingredients over low heat, stirring constantly, until chocolate is melted. Drizzle glaze over cooled bars. Refrigerate at least 1 hour until firm. For bars, cut into 8 rows by 4 rows. Store at room temperature.