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Chocolate Tray Bake

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Easy chocolate tray bake, covered with luscious, glossy frosting. This amazing cake keeps well for at least one week.

sheet cake recipe

Although so easy to make, this chocolate tray bake with frosting is really a treat! I mean, think about it! Double chocolate: in the cake itself and on top of it as well! You will just love it!

This recipe makes quite a large batch, but trust me, there was not a piece left by the end of the day. We had some guests and I had actually baked two cakes for the occasion… I could not believe it that all of this tray bake was gone so fast.

But then, it is chocolate… And hazelnuts! And an amazing frosting to make things complete!

I love cake tray bakes. Wonderful cakes like this Hazelnut Banana Cake, our favorite Apple and Cinnamon Tray Bake, or this Stewed Apple Desert.

chocolate sheet cake easy

What do you need?

Chocolate for the cake and the frosting:

  • First of all, as always when using chocolate in such large quantities, make sure you buy good quality. In this case, you will need the dark sort with about 70% cocoa, a bit more or less is OK
  • Don’t use milk chocolate or anything less than 60% cocoa to make the cake.
  • For the frosting, you will need semi-sweet chocolate.


  • I use a little ground cardamom to flavor the batter. I love it, but if you don’t like it or don’t have it, you can leave it out or replace it with cinnamon.

Other ingredients: ground hazelnuts, unsalted butter, eggs, flour, heavy/double cream.

 How to make?

Making this decadent chocolate tray bake with hazelnuts is really a simple affair.

  • Before you start stirring the batter, you will have to grate the chocolate. You can easily do that in the food processor. In this case, chop it into small pieces and grind them in the food processor. This will happen quickly, so don’t overdo it or it will start to melt.
  • If you don’t want to use the food processor, you can easily grate it on a regular grater.
  • To make the batter, mix together the dried ingredients: flour, hazelnuts, grated chocolate, cardamom (if using), and salt. Set aside.
  • In another large bowl, beat the eggs, sugar, and soft butter together until nice and fluffy.
  • Add the dried ingredients and incorporate them.
  • Pour this mixture onto a baking tray lined with baking paper and bake in a preheated oven for 25 minutes.
  • Leave to rest for about 15 minutes, cut it into squares but leave the squares on the tray. Let the cake cool completely on the tray.
  • Make the glaze: bring the cream to a light simmer. Remove and stir in the chopped semi-sweet chocolate, sugar, and cubed butter. Stir well until melted and glossy.
  • Carefully pour the glaze all over the cake and let it set for about an hour or longer. The glaze will not become completely solid, it will set but it will remain soft.
  • Decorate each square with decoration of choice.
slice of chocolate hazelnut cake

How to keep?

  • Keep the chocolate tray bake squares in an airtight container in a cool place (not necessarily refrigerated, a cold cellar would do).
  • They will keep for at least one week.
  • The glaze keeps well for 3 -4 days in the fridge and it can be frozen for a while as well.
  • If you have some leftover glaze, you can pour that on top of ice cream or waffles, for instance, as a kind of sauce.
chocolate hazelnut cake

More frosted chocolate cakes

Do you like this recipe?

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chocolate tray bake with shiny icing on a large baking tray seen from above

Chocolate Tray Bake

Easy chocolate tray bake, covered with a luscious, glossy chocolate frosting. This amazing chocolate cake keeps well for at least two weeks.
5 from 1 vote
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Course: Cakes
Cuisine: English
Prep Time: 20 minutes
Cook Time: 25 minutes
Total Time: 45 minutes
Servings: 18
Calories: 474kcal
Author: Adina


  • Chocolate tray bake:
  • 250 g/ 8.8 oz good quality dark chocolate 70% cocoa
  • 6 eggs medium Germany, large US
  • 250 g/ 8.8 oz/ 1 cup unsalted butter room temperature
  • 250 g/ 8.8 oz/ 1 ¼ cups granulated sugar
  • 100 g/ 3.5 oz/ ¾ cup + 1 tablespoon flour
  • 250 g/ 8.8 oz/ 2 cups ground hazelnuts
  • ¼ teaspoon ground cardamom optional (Note)
  • a pinch of salt
  • Frosting:
  • 175 g/ 6.2 oz/ 1 cup chopped semi-sweet chocolate
  • 125 ml/ 4.2 fl.oz/ ½ cup heavy/ double cream
  • 1 tablespoon granulated sugar
  • 75 g/ 2.6 oz/ ¼ cup + 1 tablespoon unsalted butter
  • Decoration:
  • chocolate decoration of choice


Chocolate traybake:

  • Preheat the oven to 180 degrees Celsius/ 360 degrees Fahrenheit. Line a baking tray with baking paper.
  • Chop the chocolate. Place the pieces into a food processor and grind finely. Don’t overdo it or the chocolate will start to melt. Alternatively, you can grate the chocolate on a regular grater.
  • Place the eggs, soft butter, and sugar into a bowl. Mix until fluffy.
  • In another bowl, mix together the flour, hazelnuts, grated dark chocolate, ground cardamom (if using), and a pinch of salt. Add the mixture to the egg and butter mixture and incorporate.
  • Pour the batter onto the prepared baking tray and level the surface. Bake for 25 minutes.
  • Leave to rest for about 15 minutes, then cut it into pieces. Leave to cool completely onto the baking tray.

Chocolate glaze:

  • Chop the semi-sweet chocolate finely. Set aside.
  • Pour the cream into a small saucepan. Bring to a light simmer. Remove from the heat and stir in the chocolate, sugar, and cubed butter. Stir well until the chocolate is completely melted.
  • Slowly, pour the frosting over the cake. Leave to set, but keep in mind that it will not become solid, it remains slightly soft and glossy.
  • Decorate with chocolate decoration of choice.


The cardamom can be left out or replaced with cinnamon.


Serving: 1square | Calories: 474kcal | Carbohydrates: 34g | Protein: 7g | Fat: 36g | Saturated Fat: 17g | Polyunsaturated Fat: 17g | Cholesterol: 109mg | Sodium: 39mg | Fiber: 4g | Sugar: 24g
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Sunday 19th of February 2023

Hi is it self raising or plain flour please?


Monday 20th of February 2023

Hi Adele. Plain flour.


Tuesday 6th of October 2020

What size is the baking pan you are using? Looks delicious!


Tuesday 6th of October 2020

Hi Mary. 30x40 cm/12x16 inch. A little more or less is fine.


Friday 7th of December 2018

I love the classic combo of chocolate and hazelnut...the cake looks wonderful!