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Rich, chocolatey and delicious mayonnaise chocolate brownies
4.93 from 13 votes

Mayonnaise Chocolate Brownies

These chocolate brownies with mayonnaise are rich, gooey, and deliciously simple. At first glance it seems an odd combination, but the main ingredients in mayonnaise are eggs and oil so it makes perfect sense.
Servings: 18 brownies
Prep Time10 mins
Cook Time30 mins
Total Time40 mins


  • 1/3 cup plain flour - (40g)
  • 1 tsp baking powder
  • 4 tbsp cocoa powder - (25g)
  • 1 cup plain chocolate - broken into small pieces (140g)
  • 3 medium eggs
  • 1 cup caster sugar - (225g)
  • 1 tsp vanilla essence
  • 1/3 cup Mayonnaise - (110g)
  • 1/2 cup walnuts - chopped - (optional - 50g)


  • Lightly grease a 23cm square cake tin and line with baking paper.
  • Sift the flour with the baking powder and cocoa. Put the chocolate into a heat proof bowl over a saucepan of hot water and leave until melted (alternatively, microwave on medium power, stirring occasionally, until just melted).
  • In a large bowl, whisk the eggs with the sugar and vanilla until slightly thickened.
  • Whisk in the chocolate mixture. Fold in the flour mixture, mayonnaise and walnuts.
  • Pour into the prepared tin and bake in a preheated oven at 160°C for about 30-35 minutes or until a skewer inserted in the centre comes out clean.
  • Leave to cool in the tin before cutting into squares.


  • This recipe is 8 Weight Watchers Smart Points per portion.
• Please note that the nutrition information provided below is approximate and meant as a guideline only.
• Unless stated otherwise cup conversions have been made with an online tool. For accuracy please check with your favoured conversion tool. We recommend buying inexpensive digital kitchen scales.
Calories: 164kcal | Carbohydrates: 21g | Protein: 2g | Fat: 8g | Saturated Fat: 2g | Cholesterol: 30mg | Sodium: 44mg | Potassium: 73mg | Sugar: 17g | Vitamin A: 60IU | Vitamin C: 0.1mg | Calcium: 32mg | Iron: 0.6mg