1Heat oven to 325°F. Grease bottom and sides of 13x9-inch pan with shortening or cooking spray. Drain maraschino cherries, reserving juice for drizzle; set juice aside. Finely chop cherries; pat dry with paper towel.
2In large bowl, beat 1 cup powdered sugar and 1 cup butter with electric mixer on medium speed until well mixed. Beat in vanilla and eggs. On low speed, beat in flour, baking soda and salt. Stir in 1 cup chocolate chips and the cherries. Spread in pan.
3Bake 30 to 35 minutes or until top is golden brown. Immediately sprinkle with 1 cup chocolate chips. Let stand 5 minutes or until chocolate in softened. Spread chocolate evenly over crust.
4In small bowl, mix 1 cup powdered sugar, 2 tablespoons butter and 2 to 3 tablespoons reserved cherry juice until smooth and thin enough to drizzle. Drizzle over chocolate. Cool completely, about 45 minutes. For bars, cut into 8 rows by 4 rows.