Preparation / Directions:
1. Heat oven to 350 degrees. Grease rectangular pan, 13x9x2 inches. Heat margarine and brown sugar in 3-quart saucepan over low heat about 5 minutes, stirring occasionally, until margarine is melted; remove from heat.
2. Beat in vanilla and eggs with electric mixer on medium speed until blended. Add flour and baking powder; beat until well blended. Stir in half of the nuts and 1/4 cup of the baking chips. Pour mixture into pan. Sprinkle with remaining nuts and 1/2 cup of the baking chips.
3. Bake 25 to 30 minutes or until top is golden brown and center is set; cool.
4. Melt remaining baking chips and the shortening in 1-quart saucepan over low heat, stirring constantly. Pour into small resealable plastic bag; seal bag. Cut small opening in a corner of the bag. Squeeze bag to drizzle over bars. Cool until set; cut into 2x1-inch bars.