Peanut Butter Fudge Bars

These quick and easy bars have the most glorious "ribbon" of fudge running through them. I got the recipe from a friend in Chicago. Watch out! These are RICH and ADDICTIVE!!!!

• Ready In: 42 mins
• Serves: 20-24

Ingredients

• 1 (18 ounce) box  yellow cake mix
• 1  cup creamy peanut butter
• 1  egg
• 1⁄2 cup  oil
• 14  ounces sweetened condensed milk
• 6  ounces  semi-sweet chocolate chips
• 2  tablespoons butter or 2  tablespoons margarine

Directions

1. Preheat oven to 350 degrees.
2. Combine cake mix, peanut butter, egg and oil.
3. Press 2/3 of this mixture into the bottom of a 9x13 pan.
4. Bake for 10 minutes.
5. Cool on wire rack for 5 minutes.
6. Meanwhile, in heavy saucepan, heat and stir sweetened condensed milk, chocolate chips and butter over low heat until blended.
7. Pour this chocolate mixture over the par-baked crust.
8. Sprinkle with remaining crust crumb mixture.
9. Bake an additional 20-25 minutes or until golden.
10. Cool on wire rack.