Chocolate Streusel Bars

From the Hershey's website

• Ready In: 45 mins
• Serves: 36
• Yields: 36 bars

Ingredients

• 1 3⁄4 cups all-purpose flour
• 1  cup sugar
• 1⁄4 cup  cocoa
• 1⁄2 cup butter (1 stick) or 1⁄2 cup margarine (1 stick)
• 1  egg
• 1 (14 ounce) can sweetened condensed milk (not evaporated milk)
• 2  cups  semi-sweet chocolate chips, divided (12-oz. pkg.)
• 1  cup  nuts, coarsely chopped

Directions

1. Heat oven to 350°F
2. Grease 13x9x2-inch baking pan.
3. Stir together flour, sugar and cocoa in large bowl.
4. Cut in butter until mixture resembles coarse crumbs.
5. Add egg; mix well.
6. Set aside 1-1/2 cups mixture.
7. Press remaining mixture onto bottom of prepared pan.
8. Bake 10 minutes.
9. Meanwhile, in medium microwave-safe bowl, place sweetened condensed milk and 1 cup chocolate chips; stir.
10. Microwave at HIGH (100%) 1 to 1-1/2 minutes or until chips are melted and mixture is smooth when stirred; pour over crust.
11. Add nuts and remaining chips to reserved crumb mixture. Sprinkle over top.
12. Bake an additional 25 to 30 minutes or until center is almost set.
13. Cool completely in pan on wire rack.
14. Cut into 36 bars.