Step 1

Pre-heat the oven to 355 ºF (180 ºC) and line an 8x8 inch (20x20 cm) square baking tin with baking/greaseproof paper.If you want to make a thinner and larger sheet cake, you can use a larger baking tin – but you might have to adjust the baking time slightly.

Step 2

In a the bowl of stand mixer fitted with the paddle attachment (or using a hand mixer with the double beater attachments), cream the butter and sugar together until pale and fluffy.

Step 3

Add the eggs, one at a time, and beat well after each addition.

Step 4

Add the molasses and mix well until fully incorporated.

Step 5

Sift together the gluten free flour blend, xanthan gum, baking powder, baking soda, salt and spices. Add them to the mixer and beat well until you get a smooth batter.

Step 6

Add the milk and mix until you get a smooth cake batter with no clumps.

Step 7

Transfer the cake batter into the lined baking tin and smooth out the top. Bake in the pre-heated oven at 355 ºF (180 ºC) for 36 - 38 minutes, or until an inserted toothpick comes out clean.

Step 8

Allow to cool.

Step 9

In a the bowl of stand mixer fitted with the paddle attachment (or using a hand mixer with the double beater attachments), cream the butter until pale – about 2 minutes.

Step 10

Add the powdered sugar to the butter and beat for about 5 minutes, until pale and fluffy. Add the cinnamon and mix until it's evenly distributed.

Step 11

While the mixer is running on slow speed, slowly drizzle in the heavy cream. Once completely incorporated, increase the mixing speed to high for about 1 minute.

Step 12

Once the cake is cool, frost it with the cinnamon buttercream frosting. Create swirls in the frosting using the back of the spoon or an offset spatula.

Step 13

Decorate with sprinkles of choice.

Step 14

Enjoy!

Step 15

The gingerbread sheet cake keeps well in a closed container in a cool dry place for 2 - 3 days.