Name: Double Chocolate Chip Muffins
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Ingredients: 250 g plain flour; 60 g good-quality cocoa powder (I use a Dutch-processed one for a darker colour); 200 g caster sugar; 2 teaspoons baking powder; ½ teaspoon bicarbonate of soda; ½ teaspoon fine sea salt; 2 large eggs (at room temperature); 240 ml buttermilk (shaken well); 120 ml vegetable oil (or another neutral oil like rapeseed); 2 teaspoons vanilla extract; 200 g dark chocolate (70% cocoa, roughly chopped into small chunks); 100 g milk chocolate chips or chopped milk chocolate (for extra sweetness)

There are mornings, particularly those grey Saturday ones when the rain taps gently at the window, that call for a specific kind of kitchen project. Not a rushed affair, but a slow, deliberate act of creation that fills the house with the scent of vanilla and warm cocoa. This is exactly that recipe—a batch of Double Chocolate Chip Muffins that are less about a quick breakfast and more about the joy of making something beautiful with your own hands.

Recipe Overview

Prep Time: 15 minutes
Cook Time: 20 minutes
Total Time: 35 minutes
Servings: 12 standard muffins
Difficulty: Easy

Why You’ll Love This Double Chocolate Chip Muffins

Deep, Rich Flavour: Using both cocoa powder and melted dark chocolate in the batter creates a depth of flavour that simple cocoa recipes simply cannot match.
Perfectly Tender Crumb: The combination of buttermilk and a gentle hand with mixing yields a muffin that is soft, moist, and never dry.
Generous Chocolate Distribution: Every single bite contains a little pocket of melted chocolate, ensuring no mouthful is left wanting.
Simple, Reliable Method: This recipe uses the standard muffin method—no stand mixer or complicated techniques required, just a bowl and a whisk.
A Joyful Weekend Project: The process itself is soothing; measuring, stirring, and watching the domes rise in the oven is a lovely way to spend a quiet hour.

Double Chocolate Chip Muffins

20 min prep · 20 min cook · 12 servings

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Ingredients You’ll Need

250g plain flour
60g good-quality cocoa powder (I use a Dutch-processed one for a darker colour)
200g caster sugar
2 teaspoons baking powder
½ teaspoon bicarbonate of soda
½ teaspoon fine sea salt
2 large eggs, at room temperature
240ml buttermilk, shaken well
120ml vegetable oil (or another neutral oil like rapeseed)
2 teaspoons vanilla extract
200g dark chocolate (70% cocoa), roughly chopped into small chunks
100g milk chocolate chips or chopped milk chocolate (for extra sweetness)

Tip: For the best texture, ensure your eggs and buttermilk are at room temperature before you begin. Cold ingredients can make the batter seize and result in a denser muffin.

How to Make Double Chocolate Chip Muffins

Preheat and prepare. Preheat your oven to 200°C (180°C fan) and line a 12-hole muffin tin with paper cases. The oven needs to be hot to give those muffins a good initial lift.
Whisk the dry ingredients. In a large bowl, sift together the flour, cocoa powder, sugar, baking powder, bicarbonate of soda, and salt. Whisk them thoroughly until the mixture is a uniform, dark brown colour and feels light and airy when you lift the whisk. You should see no lumps of cocoa.
Combine the wet ingredients. In a separate jug or medium bowl, whisk the eggs until they are frothy and pale yellow. Add the buttermilk, vegetable oil, and vanilla extract. Whisk again until everything is fully combined and looks like a single, glossy liquid.
Mix the batter (do not overmix). Pour the wet ingredients into the bowl of dry ingredients. Using a rubber spatula, fold the mixture together gently. Stop as soon as you see the last streak of flour disappear. The batter will look lumpy and slightly thick—this is exactly what you want. Overmixing at this stage will develop the gluten and make your muffins tough.
Fold in the chocolate. Add the chopped dark chocolate and the milk chocolate chips to the batter. Fold them in with just two or three turns of the spatula. You want the chocolate evenly distributed, but the batter should still look slightly irregular.
Rest the batter (crucial step). Cover the bowl with a clean tea towel and let the batter rest at room temperature for 15 minutes. During this time, the starch in the flour will absorb the liquid, which helps create a higher, domed top. You will notice the batter thickening slightly.
Fill the cases. Use a large ice cream scoop or two spoons to divide the batter evenly among the 12 paper cases. Fill each case right to the top—almost overflowing. The batter will be quite stiff and mounded. This is the secret to a tall, bakery-style muffin.
Bake until domed and fragrant. Place the tin in the preheated oven and bake for 18–22 minutes. At the 10-minute mark, the kitchen will begin to smell deeply of chocolate. The muffins are ready when the tops are firm to a gentle touch and spring back, and a skewer inserted into the centre comes out with a few moist crumbs (not wet batter). The edges will have pulled away slightly from the paper cases.
Cool in the tin. Remove the tin from the oven and let the muffins cool in the tin for 5 minutes. This allows the structure to set. The aroma at this point is absolutely intoxicating—rich, sweet, and deeply comforting.
Transfer to a wire rack. After 5 minutes, carefully lift the muffins out of the tin and place them on a wire rack to cool completely. If you try to move them immediately, they will be too fragile and might crumble.

Tips From My Kitchen

Use good quality chocolate: This is not the place for cheap cooking chocolate. The flavour of the muffin hinges on the chocolate you use. After testing this recipe five times, I finally got it just right by using a 70% dark chocolate bar for the main chunks and a good-quality milk chocolate for the sweeter chips. The difference in taste is remarkable.
Do not overmix the batter: I cannot stress this enough. Muffin batter should be lumpy. When you combine the wet and dry ingredients, mix until you can no longer see dry flour, then stop immediately. Overmixing creates tunnels and a rubbery texture.
Resting the batter is non-negotiable: That 15-minute rest is not a suggestion; it is the key to getting those tall, domed tops. It allows the gluten to relax and the starch to hydrate, giving you a lighter, higher muffin.
Fill the cases high: To get a proper dome, you must fill the paper cases almost to the brim. A standard muffin case holds about 100g of batter, and you should use every bit of it. The batter will mound up, and that mound will bake into a beautiful round top.
Adjust for your oven: Every oven runs slightly differently. Start checking your muffins at 18 minutes. If they are browning too quickly on top but are still gooey in the middle, lay a sheet of foil loosely over the top of the tin for the final 3–4 minutes of baking.

Common Mistakes to Avoid

Overcrowding the pan: If you are using a smaller muffin tin or making mini muffins, do not try to bake too many at once without adjusting the time. Overcrowding the oven prevents proper air circulation, leading to uneven baking and pale, flat tops. Ensure there is space around the tin for hot air to flow.
Wrong temperature: Baking at too low a temperature will cause the muffins to spread out rather than rise up. You need the initial blast of 200°C (180°C fan) to set the dome. If your oven runs cool, increase the temperature by 10 degrees.
Skipping the rest time: I used to skip this step, thinking it was a waste of time. The results were always flatter and denser. The rest time allows the batter to thicken and the gluten to relax, which directly contributes to a taller, more tender muffin. Do not skip it.

Delicious Variations to Try

Spicy Version: Add ½ teaspoon of ground cinnamon and a pinch of cayenne pepper to the dry ingredients. The subtle warmth of the spice pairs beautifully with the dark chocolate, creating a complex, grown-up flavour profile.
Vegetarian/Vegan Option: To make this plant-based, replace the eggs with two flax eggs (2 tablespoons ground flaxseed mixed with 6 tablespoons water, left to gel for 10 minutes). Use a plant-based milk mixed with 1 tablespoon of lemon juice instead of buttermilk, and ensure your chocolate is dairy-free. The texture will be slightly denser but still very moist.
Different Protein: For a nutty twist, swap 50g of the plain flour for 50g of finely ground almonds or hazelnuts. This adds a lovely, tender crumb and a subtle nuttiness that complements the chocolate beautifully. You can also fold in 60g of chopped, toasted walnuts along with the chocolate.

What to Serve With Double Chocolate Chip Muffins

A cold glass of milk is the classic, perfect companion.
A warm cup of strong coffee or a creamy latte balances the sweetness.
For a decadent dessert, serve one warm with a scoop of vanilla ice cream and a drizzle of chocolate sauce.
These muffins are also lovely with a pot of hot tea on a rainy afternoon.

Still hungry for ideas? You might also love Bakery Style Chocolate Chip Muffins Recipe from our sister kitchens.

Frequently Asked Questions

Why did my muffins come out flat?

Flat muffins are usually the result of either an oven that is not hot enough or a batter that was overmixed. Ensure your oven is fully preheated to 200°C, and resist the urge to stir the batter until it is perfectly smooth. A lumpy batter is a good batter. Also, make sure your baking powder is fresh—it loses its potency after about six months.

Can I use water instead of buttermilk?

You can, but the result will not be the same. Buttermilk provides acidity, which reacts with the bicarbonate of soda to create lift, and it also adds tenderness and a subtle tang. If you do not have buttermilk, you can make a quick substitute by adding 1 tablespoon of lemon juice or white vinegar to 240ml of whole milk and letting it stand for 5 minutes until it curdles slightly.

How do I store these muffins and keep them fresh?

Store the muffins in an airtight container at room temperature for up to three days. To keep them moist, place a piece of kitchen paper at the bottom of the container and another on top of the muffins to absorb any excess moisture without making them soggy. My kids absolutely devour this every time I make it, so they rarely last more than a day in our house!

Can I freeze these Double Chocolate Chip Muffins?

Absolutely. Freeze the muffins in a single layer on a baking tray until solid, then transfer them to a freezer-safe bag or container. They will keep for up to three months. To reheat, simply microwave one for 20–30 seconds, or pop it into a low oven (150°C) for about 8 minutes to restore its fresh-baked texture.

Can I use only one type of chocolate?

Yes, you can use all dark chocolate or all milk chocolate if you prefer. Using two types gives a more complex flavour and texture—the dark chocolate provides a deep, slightly bitter richness, while the milk chocolate adds creamy, sweet pockets. If you only have one, use 300g of your chosen chocolate.