This super moist chocolate birthday cake is the one I make for everyone’s birthday, and also when we feel like birthday cake and it is no one’s birthday at all. It is simple, reliable, and always turns out soft and rich with a deep chocolate flavour. I love it because it uses pantry ingredients and stays moist for days. Add a thick layer of icing and a scatter of hundreds and thousands, and it feels like a proper celebration every time.
What Is Super Moist Chocolate Birthday Cake
Super moist chocolate cake with oil is a soft chocolate cake made using cocoa powder and oil instead of butter or melted chocolate. The oil keeps the crumb tender and moist, while the cocoa gives a rich chocolate flavour using simple pantry ingredients.
This style of cake mixes in one bowl with no creaming step, which makes it easy to make and reliable every time.
Why You’ll Love This Super Moist Chocolate Birthday Cake
- Super moist texture. The oil keeps the cake soft and tender for days.
- No butter needed. Perfect when the fridge is empty or you want a simple bake.
- One bowl recipe. Less mess and no mixer required.
- Rich chocolate flavour. Cocoa powder gives a deep chocolate taste without needing real chocolate.
- Reliable result. Easy method that works every time.
Ingredients For Super Moist Chocolate Birthday Cake
- Plain flour: Gives the cake structure while keeping the crumb soft and light.
- Cocoa powder: Provides the chocolate flavour without needing melted chocolate. Use a good quality cocoa for the best result.
- Caster sugar: Adds sweetness and helps create a soft texture.
- Brown sugar: Adds moisture and a deeper flavour, which makes the cake richer.
- Baking powder and baking soda: Help the cake rise and keep it light.
- Salt: Balances the sweetness and enhances the chocolate flavour.
- Eggs: Bind the batter and add richness.
- Oil: Keeps the cake moist and tender for days. Use a neutral oil such as vegetable or canola.
- Milk: Adds moisture and helps create a smooth batter.
- Boiling water: Helps bloom the cocoa and creates a softer, more tender crumb.
- Vanilla extract: Adds depth and rounds out the chocolate flavour.
ICING
- Icing sugar mixture: Gives the icing structure and sweetness while keeping it smooth and easy to spread.
- Cocoa powder: Adds the chocolate flavour and gives the icing a rich, deep colour.
- Melted butter: Adds richness and helps create a soft, glossy finish. It also helps the icing set slightly.
- Milk: Loosens the icing to a spreadable consistency. Add a little at a time to control thickness.
- Vanilla extract: Rounds out the flavour and enhances the chocolate.
How To Make Super Moist Chocolate Cake
- Preheat your oven to 160°C fan forced or 180°C conventional. Grease and line a 20 cm round cake tin.
- Add flour, cocoa powder, caster sugar, brown sugar, baking powder, baking soda, and salt to a large bowl. Mix well to combine.
- In a jug, whisk together eggs, oil, milk, and vanilla until smooth.
- Pour the wet ingredients into the dry ingredients and mix until smooth and lump free.
- Add the boiling water and stir gently until the batter is smooth. The batter will be thin.
- Pour the batter into the prepared tin.
- Bake for 45 to 50 minutes or until a skewer inserted into the centre comes out clean or with a few moist crumbs.
- Leave the cake in the tin for 10 minutes, then transfer to a wire rack to cool completely. Once cooled, spread over the chocolate cocoa icing. Decorate as desired.
Tips For The Best Chocolate Cake
- Use grams for accuracy: Too much flour can make the cake dense.
- Use good quality cocoa powder such as a Dutch process cocoa powder. It makes a noticeable difference in flavour (Woolies make a Dutch process one and its great – my go to cocoa powder).
- Do not overmix: Mix until just smooth to keep the crumb soft.
- The batter will be thin: This is correct and helps create a moist cake.
- Oven door: Do not open the oven before 45 minutes. The cake needs steady heat to rise and set. Opening the door too early can cause the centre to sink. If it does sink slightly, its not big deal. Cake will still taste and look amazing.
- Check for doneness: Start checking at 45 minutes. Insert a skewer into the centre. It should come out clean or with a few moist crumbs.
- Let the cake cool completely before icing. This stops the icing from melting.
Serving Suggestions
Serve this chocolate birthday cake with chocolate icing and a light scatter of hundreds and thousands, or decorate it your way with sprinkles, lollies, or chocolate pieces. Add candles or small figurines to suit the occasion. Keep it simple or dress it up depending on what you have on hand. Perfect for birthdays, last minute cakes, or when you want something easy that still feels special.
For a classic option, skip the sprinkles and serve as an everyday chocolate cake. The rich icing and soft crumb are enough on their own, making it ideal for afternoon tea or dessert.
For extra indulgence, add whipped cream or a scoop of vanilla ice cream. Fresh berries such as strawberries or raspberries help balance the richness.
You can also turn it into a layered cake by baking in two tins and adding icing through the centre. For a quick dessert, warm a slice and serve with cream, custard or vanilla bean yoghurt.
Storage
FRIDGE: Store the cake in an airtight container in the fridge for up to 5 days. The oil helps keep it soft, even when chilled.
REHEAT: Bring slices to room temperature before serving or warm briefly in the microwave for 10 to 15 seconds to soften.
FREEZER: Wrap slices or the whole cake tightly and freeze for up to 2 months. Thaw at room temperature before serving.
Frequently Asked Questions
Can I use just caster sugar?
Yes, you can use all caster sugar in this recipe. The cake will still bake well and have a soft texture. The reason for using some brown sugar is to add extra moisture and a deeper flavour, which gives a slightly richer result. If you only have caster sugar on hand, the cake will be a little lighter in flavour but still soft and delicious.
Can I use water instead of milk?
Yes, water works well in this recipe. Milk adds a touch of richness and helps round out the flavour, but water will still give you a soft and moist cake. If using water, you may notice the flavour is slightly less creamy, though still chocolatey and satisfying.
What type of oil works best?
Use a neutral oil such as vegetable oil, rice bran or canola oil. These oils do not add flavour, which allows the chocolate to stand out. Avoid strong oils like olive oil, as they can change the taste of the cake. If you do want to experiment, a light olive oil can work, though it will give a slightly different flavour profile.
Why is the batter so thin?
The batter will look much thinner than a typical cake batter, and this is expected. The boiling water helps bloom the cocoa powder and creates a softer, more tender crumb. A thinner batter also helps the cake stay moist after baking. As long as everything is mixed well, the cake will bake up perfectly.
Can I make this into cupcakes?
Yes, this recipe works well as cupcakes. Divide the batter into a lined muffin tray, filling each about two thirds full. Bake for 18 to 22 minutes, or until a skewer inserted comes out clean. The cupcakes will be soft and moist, just like the cake, and are great for easy serving or lunchboxes.
This super moist chocolate cake with oil is one of those easy bakes that delivers every time. If you make it, leave a comment and let me know how it turned out or how you served it.
More Baking Recipe To Try
- Sticky Ginger Cake
- Brown Sugar Blueberry Banana Crumble Muffins
- Self-Saucing Sticky Date Pudding
- Easy 5-Ingredient Chocolate Chip Cookies
- Banana Bread with Oil, Easy One Bowl Recipe
- Coconut & Lemon Syrup Cake
Super Moist Chocolate Birthday Cake
Ingredients
- 1 ½ cups (225g) plain flour
- ¾ cup (75g) Dutch cocoa powder (¾ cup)
- 1 cup (200g) caster sugar
- ¾ cup (150g) brown sugar
- 1 ½ teaspoons baking powder
- 1 ½ teaspoons bicarb soda
- ½ teaspoon salt
- 2 eggs
- 1 teaspoon vanilla extract
- ½ cup (110g) neutral oil, such as vegetable, rice bran or canola
- 1 cup (250g) milk
- ½ cup (125g) boiling water
Icing
- 1 ½ cups (180g) icing sugar mixture
- 25g (¼ cup) Dutch cocoa powder
- 40g (2 tablespoons) butter, melted
- 2-3 tablespoons milk
- ½ teaspoon vanilla extract
Instructions
- Preheat oven to 180°C (160 ℃ fan forced). Grease and line a 20 cm round cake tin.
- In a large bowl, add flour, cocoa powder, caster sugar, brown sugar, baking powder, baking soda, and salt. Mix or whisk well to combine and remove any lumps.
- In a jug, whisk together eggs, vanilla, oil and milk, until well combined.
- Pour the wet ingredients into the dry ingredients. Mix until smooth and lump free.
- Carefully pour in the boiling water. Stir gently until the batter is smooth. The batter will be thin. This is normal.
- Pour the batter into the prepared tin.
- Bake for 45 to 50 minutes, or until a skewer inserted in the centre comes out clean or with a few moist crumbs. Do not open the oven too early, or the middle may sink slightly.
- Leave the cake in the tin for 10 minutes, then transfer to a wire rack to cool completely.
icing
- Sift icing sugar mixture and cocoa powder into a bowl to remove any lumps.
- Add melted butter, 2 tablespoons milk, and vanilla.
- Mix until smooth. Add more milk a little at a time if required until the icing is soft and spreadable to your desired consistency. (I only added 2 tablespoons as I like it quite stiff)
- Spread over the completely cooled cake. Decorate as desired.
Notes
- Measurements: We use the Australian Metric measurements. 1 teaspoon = 5ml, 1 tablespoon = 20ml and 1 cup = 250ml.
- Layer Cake Option: Divide the batter between 2 x 20 cm tins or 2 x 22 cm tins for a layered cake. Reduce bake time to 25 to 30 minutes or until cooked when tested with a skewer.
- Milk Options: Full cream milk gives a richer result, though you can use light milk or even water for a budget version. The cake will still stay moist.
- Coffee Boost: Replace the boiling water with hot coffee for a deeper chocolate flavour without making the cake taste like coffee.
- Sugar Swap: You can use all caster sugar if needed, though keeping some brown sugar gives better moisture and flavour.
- Tin Variations: This batter also works in a 20 cm square tin or as cupcakes. For cupcakes, bake for 18 to 22 minutes. This cake works well in a 20 cm square tin with a similar bake time of 40 to 45 minutes. For a thinner cake, use a 23 cm square tin and start checking at 30-35 minutes.
For a slightly larger cake but not quite as high, bake in a 22cm round cake pan reducing cooking time slightly. Start checking around 35 minutes.
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