If you have ever wanted a cake that genuinely nourishes you while tasting like a total treat, this healthy sweet potato cake is exactly that. Built around real, wholesome ingredients and free from refined sugar, it is the kind of bake you can feel good about serving to family and friends alike. The natural sweetness of roasted sweet potato does a lot of the heavy lifting here, which means you need far less added sweetener than a standard sponge. Whether you are baking for a birthday, a weekend gathering or simply because you fancy something special on a Tuesday afternoon, this cake holds its own beautifully on any occasion.
Sweet potato is the real star of this recipe, and for good reason. One medium sweet potato delivers a generous hit of vitamin A, potassium and dietary fibre, so every slice is doing something genuinely useful for your body. Combined with whole wheat spelt flour, which has a naturally nuttier flavour and more fibre than white flour, the cake base has real substance without feeling heavy. Pure maple syrup provides gentle sweetness alongside a lovely caramel undertone. Coconut oil replaces butter, keeping the crumb tender and moist without the saturated fat load of a traditional sponge. A blend of cinnamon, nutmeg and ginger gives the cake that cosy, warming character that makes sweet potato bakes so irresistible in autumn and winter, though honestly it is delicious at any time of year.
The texture of this cake is soft and slightly dense in the best possible way, almost like a cross between a classic sponge and a lightly spiced loaf cake. It cuts cleanly, holds together well and develops even more flavour the day after baking. The maple cream frosting is made from thick Greek yogurt whipped with a small amount of cream cheese and a drizzle of maple syrup, giving you all the creaminess of a traditional frosting with a fraction of the sugar and none of the butter. Serve it at room temperature with a cup of tea or coffee. For something a little more indulgent, a scattering of toasted pecans or a dusting of cinnamon over the frosting looks beautiful and adds a satisfying crunch. You can also skip the frosting entirely and serve slices warm as a pudding alongside a spoonful of natural yogurt.
From a nutritional perspective, this cake offers some genuinely impressive credentials compared to a standard celebration sponge. Each serving comes in well under 300 calories, with a meaningful amount of fibre thanks to the sweet potato and spelt flour combination. Using maple syrup rather than refined white sugar means the sweetness comes with trace minerals including zinc and manganese. The Greek yogurt frosting adds a small protein boost, which you would never get from a buttercream. This recipe is also dairy-light rather than dairy-heavy, and can be made fully dairy-free with a couple of simple swaps listed in the substitutions section below. It is not a cake that pretends to be a health food supplement. It is genuinely delicious first, and happens to be far better for you than the traditional alternative. That is the kind of balance worth baking for.
Ingredients
- 400 g sweet potato (peeled, roasted and mashed, about 2 medium potatoes)
- 220 g whole wheat spelt flour (spooned and levelled)
- 2 tsp baking powder
- 0.5 tsp bicarbonate of soda
- 1.5 tsp ground cinnamon
- 0.5 tsp ground nutmeg (freshly grated if possible)
- 0.5 tsp ground ginger
- 0.3 tsp fine sea salt
- 3 large eggs (at room temperature)
- 100 ml pure maple syrup (grade A, dark for richer flavour)
- 60 ml melted coconut oil (refined for a neutral flavour)
- 1 tsp vanilla extract
- 80 ml unsweetened almond milk (or any plant milk)
- 200 g full-fat Greek yogurt (for the frosting)
- 100 g light cream cheese (for the frosting, at room temperature)
- 2 tbsp pure maple syrup (for the frosting)
- 0.5 tsp vanilla extract (for the frosting)
- 1 pinch ground cinnamon (for dusting, optional)
Instructions
- 1
Preheat your oven to 180 degrees Celsius (160 fan). Grease two 20cm round cake tins and line the bases with baking paper.
Using a loose-bottomed tin makes it much easier to remove the cakes cleanly once cooled.
- 2
If you have not already roasted your sweet potatoes, pierce them all over, roast at 200 degrees Celsius for 45 minutes until completely soft, then scoop out the flesh and mash until smooth. Allow to cool to room temperature before using.
Roasting rather than boiling gives a drier, more intensely flavoured mash that will not make the batter watery.
- 3
In a large bowl, whisk together the spelt flour, baking powder, bicarbonate of soda, cinnamon, nutmeg, ginger and salt. Set aside.
- 4
In a separate large bowl, whisk the eggs with the maple syrup, melted coconut oil and vanilla extract until well combined and slightly frothy, about 2 minutes.
Make sure the coconut oil has cooled slightly before adding it to the eggs, otherwise you risk cooking them.
- 5
Add the mashed sweet potato to the egg mixture and stir until fully incorporated. Pour in the almond milk and mix again.
- 6
Add the dry ingredients to the wet ingredients and fold gently with a spatula until just combined. Do not overmix. A few small lumps are fine and will disappear during baking.
Overmixing spelt flour can make the cake dense and slightly chewy, so a light hand is important here.
- 7
Divide the batter evenly between the two prepared tins. Smooth the tops with the back of a spoon and bake for 35 to 40 minutes, until a skewer inserted into the centre comes out clean.
- 8
Remove the cakes from the oven and allow them to cool in the tins for 10 minutes before turning out onto a wire rack. Leave to cool completely before frosting.
Frosting a warm cake will cause the yogurt frosting to slide off, so patience here really pays off.
- 9
To make the frosting, beat the room temperature cream cheese with a hand mixer or wooden spoon until smooth. Add the Greek yogurt, maple syrup and vanilla extract and beat together until thick and creamy.
If the frosting feels too soft, refrigerate it for 15 minutes before spreading.
- 10
Place one cake layer on a serving plate or cake stand. Spread half the frosting evenly over the top. Place the second layer on top and spread the remaining frosting over the surface. Dust with a little cinnamon and serve.
Chilling the assembled cake for 20 minutes before slicing helps it hold together beautifully.
Nutrition per serving
248kcal
Calories
7g
Protein
32g
Carbs
10g
Fat
4g
Fibre
13g
Sugar
195mg
Sodium
Pro Tips
- ✓
Roasting sweet potatoes rather than microwaving or boiling them gives a much drier, more flavourful mash that blends into the batter without adding excess moisture.
- ✓
Bring your eggs to room temperature before mixing as this helps them incorporate more smoothly into the batter.
- ✓
Spelt flour has a shorter gluten structure than regular wheat flour, so mix your batter gently and as briefly as possible.
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This cake tastes even better the following day once the spices have had time to mellow and deepen.
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If you want a taller, more impressive single-layer cake, bake the whole batter in one 20cm tin and increase the baking time to around 50 to 55 minutes.
Frequently Asked Questions
Variations
- •
Chocolate Sweet Potato Cake
Replace 40g of the spelt flour with 40g of unsweetened cocoa powder. Increase the maple syrup to 120ml. The sweet potato and cocoa combination is deeply rich and fudgy.
- •
Orange and Sweet Potato Cake
Add the finely grated zest of one large orange to the wet ingredients and reduce the cinnamon to half a teaspoon. Stir two tablespoons of orange juice into the frosting for a bright, citrusy finish.
- •
Mini Sweet Potato Cupcakes
Divide the batter into a lined 12-hole muffin tin and bake at 180 degrees Celsius for 20 to 22 minutes. Top each cooled cupcake with a dollop of the maple cream frosting.
Substitutions
- •Whole wheat spelt flour → Wholemeal plain flour (Use at a one-to-one ratio. The flavour is slightly more robust but works very well with the spices.)
- •Coconut oil → Light olive oil or avocado oil (Both work well at the same quantity and produce a similarly moist crumb.)
- •Maple syrup → Raw honey (Use the same quantity. Note that honey is not vegan and has a slightly more floral sweetness.)
- •Greek yogurt in frosting → Thick coconut yogurt (Use the same quantity for a fully dairy-free frosting. Choose a full-fat variety for the best consistency.)
- •Almond milk → Oat milk, soy milk or regular semi-skimmed milk (Any liquid milk works here at the same quantity.)
- •Light cream cheese → Vegan cream cheese (Brands like Violife or Kite Hill work very well in the frosting at the same quantity.)
🧊 Storage
Store the frosted cake covered in the refrigerator for up to 4 days. Bring slices to room temperature for 15 minutes before eating for the best texture and flavour. Unfrosted cake layers can be stored at room temperature, wrapped tightly in beeswax wrap or foil, for up to 2 days.
📅 Make Ahead
The cake layers can be baked up to 2 days in advance and stored wrapped at room temperature, or frozen for up to 1 month. The frosting can be made up to 24 hours ahead and kept covered in the refrigerator. Assemble the cake on the day you plan to serve it for the freshest result.
