These Chocolate Streusel Bars are a perfect dessert for any time of the year with its creamy cheesecake layer surrounded by a chocolate bottom and top layer.
Preheat oven to 350 degrees.
In a large bowl, combine flour, sugar, and cocoa.
Cut in margarine until crumbly. Mixture will be dry.
Reserving 2 cups of the crumb mixture, press remainder on bottom of an 13" x 9" baking pan.
Bake 15 minutes. While baking, prepare the next layer.
In a large mixer bowl, beat cream cheese until fluffy.
Gradually beat in condensed milk until smooth.
Add egg and vanilla, mix well.
Pour over prepared crust (after it has baked for 15 minutes).
Combine nuts with reserved crumb mixture (if desired). Sprinkle mixture evenly over cheese mixture.
Bake for 25 minutes or until bubbly.
Cool. Chill. Cut into bars. Store covered in the refrigerator.