Method
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Preparation: Preheat your oven to 180° C 160°C fan/gas mark 4). Line your baking tin with baking paper.
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Creaming: Using an electric hand whisk, beat the low-fat spread and sugar together for 2–3 minutes on a medium speed until the mixture is light and creamy.
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Egg Addition: Add the eggs one at a time, beating well after each addition. If the mixture starts to separate, stir in 1 tablespoon of the measured flour.
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Dry Ingredients: Sift the flour, bicarbonate of soda, cinnamon, and mixed spice over the mixture, then gently fold them in until just combined.
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Wet Ingredients: Stir in the grated carrots, orange juice, and half of the orange zest until evenly distributed.
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Baking: Pour the cake mixture into the prepared tin and level the surface with the back of a spoon. Bake for 30–35 minutes until risen and golden (a skewer inserted into the centre should come out clean).
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Cooling: Allow the cake to cool in the tin for 5 minutes, then turn it out onto a wire rack to cool completely.
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The Topping: In a bowl, mix the yogurt, sweetener, and vanilla extract until smooth. Spread this mixture evenly over the top of the cooled cake.
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Serving: Scatter the remaining orange zest over the topping. Cut the cake into 12 equal squares to serve.