1Heat oven to 375°F. Grease bottom only of 13x9-inch pan with shortening or cooking spray. In 3-quart saucepan, melt butter over medium heat. Remove from heat. Stir in remaining bar ingredients in order listed, mixing well after each addition. Spread batter in pan.
2Bake 35 to 45 minutes or until top is golden brown. Cool in pan on cooling rack 10 minutes.
3While bars are cooling, in small bowl, mix glaze ingredients until smooth. Drizzle over warm bars. Cool completely, about 1 hour. For bars, cut into 8 rows by 6 rows.