Butterscotch Sheet Cake with Mascarpone Icing

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Growing up a quick desert was mum grabbing a good old Sara Lee sheet cake and I would be lying if I said they tasted bad. I thought I would draw some of that nostalgia and create a sheet cake of my own that hits the same spot. This was going to have a plain icing but I can’t go past mascarpone in desert.

Butterscotch Sheet Cake with Mascarpone Icing

Cooking Time: 2 hours | Servings: 6 people


Butterscotch Sheet Cake:

  • 250 grams unsalted butter
  • 1 1/2 cups dark brown sugar
  • 2 teaspoons vanilla bean paste
  • 3 large eggs, room temperature
  • 2 1/2 cups all purpose flour
  • 1 tablespoon baking powder
  • 1/2 teaspoon salt
  • 1 1/3 cups whole/full cream milk – room temperature

Mascarpone Icing:

  • 250 grams mascarpone
  • 2 1/3 cups icing sugar
  • 200mls (1 cup) thickened cream
  • 1/3 cup unsweetened cocoa


  1. Grease your 9 X 12 inch sheet pan with baking spray and line with baking paper. Preheat oven to 180C.
  2. In a large bowl or stand mixer with paddle attachment, beat together the butter and dark brown sugar until fluffy. About 3-4 minutes.
  3. Add the vanilla beans, and add in the eggs, one at a time, until combined.
  4. Add sifted flour, baking powder, and salt.
  5. Stream in the milk, beating until just combined.
  6. Pour you batter into the lined lined sheet pan and bake for 30-35 minutes. Allow to cool completely prior to icing.
  7. To make icing, Sift icing sugar and cocoa in a stand mixer with whisk attachment (or a large bowl if using hand held beaters). Add mascarpone and cream. Whisk for 3-4 minutes on medium speed or until incorporated and whipped.
  8. Remove sheet cake from pan and place on a large platter/board. Pour icing over the top of cake and evenly spread. Slice into desired sizes.
  9. Keep in a covered airtight container in the fridge for 3-4 days, not that it will last that long.


    • For a non chocolate topping leave out cocoa
    • If you are not a fan of mascarpone simply replace it with cream cheese

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Ciao I’m Marylin:

If you’re a foodie who’s looking for ideas on what to cook, as well as recipes that deliver on flavour, every time, you’re in the right place.

As a recipe developer, cookbook author (and wife and mum to a team of amateur food critics), in my Casa you’ll find delicious inspiration you can use every day.


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Always a winner!

April 29, 2023

I absolutely love this recipe. It’s always a winner where ever I take it, plus the whole family loves it too. The recipe is easy to follow and the icing is to die for. Highly recommend everyone try this beautiful slab cake. It’s my go-to cake now


Response from Dinner ideas for foodies

Awwww thanks Tori, I love that you and the family love this recipe. Thanks for giving it a go and the icing is definitely to die for 🤤

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