Black Widow Bars Recipe

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Black Widow Bars
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  1. Heat oven to 350 degrees.
  2. Very lightly grease bottom of 9-inch round baking pan.
  3. Line bottom with parchment or wax paper.
  4. In a heatproof mixing bowl, whisk together melted butter and peanut butter until smooth.
  5. Add brown sugar, eggs and vanilla, whisking until smooth.
  6. Add flour and baking powder.
  7. Stir with spoon until moistened.
  8. Stir in 1 cup chopped chocolate chips and scrape bowl well.
  9. Spoon into prepared pan and bake for 25-30 minutes just until tester inserted in center comes out clean.
  10. Cool 15 minutes in pan.
  11. Run knife around pan edge to loosen.
  12. Turn onto cake plate and remove paper.
  13. Cool 30 minutes before frosting.
  14. For the frosting: In a 4-cup Pyrex measure or heatproof bowl, combine hot melted butter with semi-sweet chips.
  15. Stir continuously until chocolate melts and mixture is smooth. Add 1 cup powdered sugar and 1/4 cup of the chocolate syrup.
  16. Stir until combined. Mixture will thicken and become stiff.
  17. Add remaining 1 cup powdered sugar, 1/4 cup milk and 1/4 cup chocolate syrup.
  18. Stir until smooth.
  19. Allow frosting to stand 2 minutes.
  20. Add remaining 1/4 cup chocolate syrup, adjusting if too stiff.
  21. Frosting should appear smooth and satiny.
  22. Frost top and sides of cake.
  23. Set aside.
  24. For the web decoration: In a small bowl, combine 2/3 cup powdered sugar and 1 tablespoon milk.
  25. Stir until smooth, adding milk until a slightly runny glaze forms.
  26. Spoon into a small decorating bag fitted with a round writing tip.
  27. Work quickly; do not allow fudge frosting to dry.
  28. Starting in the center of cake, using white glaze, pipe circles on top about 1/2 inches apart.
  29. Using a toothpick, lightly drag lines through the frosting, from outer edges of cake to center, about 1 inch apart.
  30. Decorate with spiders and cut into small wedges.
  31. Store at room temperature.
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Nutrition Facts

Per ServingPer 100 g
Amount Per 1 Serving
Calories 373.43 Kcal (1563 kJ)
Calories from fat 142.57 Kcal
% Daily Value*
Total Fat 15.84g 24%
Cholesterol 46.28mg 15%
Sodium 25.56mg 1%
Potassium 104.68mg 2%
Total Carbs 57.37g 19%
Sugars 45.04g 180%
Dietary Fiber 2.5g 10%
Protein 3.72g 7%
Vitamin A 0.1mg 3%
Iron 1.4mg 8%
Calcium 29.9mg 3%
Amount Per 100 g
Calories 397.88 Kcal (1666 kJ)
Calories from fat 151.91 Kcal
% Daily Value*
Total Fat 16.88g 24%
Cholesterol 49.31mg 15%
Sodium 27.23mg 1%
Potassium 111.54mg 2%
Total Carbs 61.13g 19%
Sugars 47.99g 180%
Dietary Fiber 2.67g 10%
Protein 3.96g 7%
Vitamin A 0.1mg 3%
Iron 1.4mg 8%
Calcium 31.9mg 3%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.


  • salty
  • savory
  • bitter
  • sweet
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Recipe Tags

Weightwatchers Points

  • 8.3
  • 10

Good Points

  • saturated fat free,
  • very low sodium,
  • good source of fiber

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