I came across this simple recipe today. It was amongst many others that I received at my bridal shower. I fondly remember my husband's Aunt Fran. She made a lot of great desserts. This is one of many of hers. I hope you all enjoy these simple yet delicious bars.
in a large mixing bowl . Beat butter, sugar and eggs until fluffy.
Add in flour and salt. Beat until well combined. Add in vanilla and mix well.
Divide dough into thirds. At this point you can add nuts to the remaining two thirds of batter, if you prefer. Place two thirds of the dough in the 9 x 13" pan. Spread evenly.
Add the melted chocolate to the remaining one third of batter. Mix well. At this point if you want to deeper chocolate flavor add a couple tablespoons of unsweetened cocoa powder.
Place spoonfuls of chocolate mixture randomly across top of batter in pan. Run a knife through mixture to make a marbled look. bake at 350° until done. It should take approximately 30 minutes. Cool and cut into squares.
Note: I also think the bars would be really great with a nice dark chocolate frosting.