Chocolate marbled blondies

This was an easy Sunday morning venture! I was craving chocolate cake (go figure!) and I didn't have the components. This recipe was modifed from "The Great American Cookie Cookbook". Sometimes you just have to work with what you have. I would have liked these to have been sweeter and perhaps if I had been able to follow the original recipe, they would have been. The original recipe called for a cup of mini M & Ms. Make sure to swirl the chocolate into the blonde part well or you'll have gobs of dark, slightly bitter chocolate (like I did). Those gobs didn't taste so good.
Chocolate Marbled Blondies
Makes 16 blondies
Ingredients:
1/2 cup softened butter
1/2 cup packed brown sugar
1 egg
2 tsp vanilla extract
1 1/2 cup flour
1 1/4 tsp baking soda
2/3 cup chopped walnuts (choc. chips, m&m's or whatever you have on hand)
4 oz softened cream cheese
2 tb granulated sugar
1 egg yolk
1/4 cup unsweetened baking cocoa powder
1/4 cup dark chocolate (candy bar or the like, I used some Stam chocolate pieces I received for Xmas)

Directions:
Preheat oven to 350. Grease a 9x9 pan.

Cream together the butter and brown sugar in a large bowl until fluffy. Beat in the egg and vanilla. In a separate bowl, combine flour and baking soda. Blend flour mixture into butter mixture. Stir in nuts. Dough will be stiff like cookie dough.

In a separate bowl, mix cream cheese, granulated sugar and egg yolk until smooth. Stir in cocoa powder and blend well. Place chocolate cheese mixture in nine equal portions on the bottom of the greased pan. Place the blondie dough around the chocolate dough in the pan. Swirl the two together with a fork.

Bake 25 to 30 minutes. Cool completely. Cut into squares.

Melt chocolate in microwave in 30 second intervals until smooth. Pour into ziploc bag and cut a small hole in the tip. Drizzle over blondies. Allow to cool and devour with a large glass of milk!