6-Inch Apple Cake Recipe: Single-Serve Spice Cake in a Mug

This 6-inch apple cake recipe delivers all the warmth of a classic spice cake in a single, perfect portion—no fuss, no mess, just pure comfort. I developed this recipe after realizing how often I wanted a slice of apple cake but couldn't justify baking an entire pan. The secret lies in the perfect balance of cinnamon, nutmeg, and brown sugar, which caramelizes beautifully while keeping the texture moist and tender.

The beauty of this recipe is its simplicity: just 15 minutes of prep and 25 minutes in the oven at 350°F, yielding a cake with a golden crust and a tender crumb infused with apple flavor. I use a 6-inch round pan for even baking, ensuring the edges stay crisp while the center remains soft. The optional glaze (powdered sugar + lemon juice) adds a touch of elegance without overpowering the natural spice notes.

What makes this single-serve apple cake truly special is how it captures the essence of a traditional apple cake—warm, aromatic, and just sweet enough—while adapting to modern needs. Whether you're craving a quick dessert after dinner or a cozy treat for one, this recipe delivers restaurant-quality results with minimal effort. The cake pairs beautifully with a scoop of vanilla ice cream or a dollop of whipped cream for extra indulgence.

For those looking to customize, you can swap regular flour for gluten-free or use applesauce to reduce sugar slightly. The recipe scales effortlessly if you ever want to double it for a larger pan. Let’s bake this perfectly portioned apple cake today!

Ingredients for 6 inch apple cake

Six simple ingredients make a single-serving apple cake with restaurant-worthy spice notes.

The Granny Smith apple is key here—its tartness balances the sweetness perfectly. Grab one from the produce section (the smaller ones are usually sweeter), or use Honeycrisp if you prefer milder flavor. For the spices, Penzeys or bulk bins at Whole Foods have the freshest ground cinnamon and nutmeg, but the grocery store stuff works fine if it's labeled 'freshly ground.' The butter should be room temperature—microwave it for 20 seconds if it's cold. And don't skip the vanilla—pure extract makes all the difference in that warm, comforting aroma.

No Granny Smith? Fuji or Gala work in a pinch, but peel and dice them extra small so they don't make the cake too dense. Short on brown sugar? Substitute with white sugar plus 1/4 tsp molasses for depth. The glaze is totally optional, but if you're making it, Trader Joe's has the best powdered sugar (it's super fine and doesn't clump). For a dairy-free version, swap the butter for coconut oil—just know the texture will be slightly denser. And if you're gluten-free, use a 1:1 baking flour blend like Bob's Red Mill.

This cake keeps well for 3 days in an airtight container at room temperature, though it's best enjoyed fresh. The glaze sets within 10 minutes, so don't rush it—let it drip down the sides for that fancy look. For make-ahead prep, mix the dry ingredients and store them in a jar for up to 1 week, then just add the wet ingredients when ready. Pairs perfectly with a scoop of vanilla bean ice cream or a dollop of whipped cream—trust me on that.

Step-by-step instructions for single-serve apple cake

Here's how to create a perfectly spiced, moist cake in minutes using just a mug.

Peel and finely dice the 1 medium Granny Smith apple into small, even pieces—about ¼-inch cubes. The smaller the dice, the more flavor they'll release into the cake. Place the diced apple in a small bowl and toss with 1 teaspoon of the granulated sugar and ½ teaspoon of the lemon juice. This sweet-tart mixture will keep the apples from turning mushy while adding brightness to the flavor. Let it sit while you mix the batter.

I like to use a microplane for the lemon juice to avoid bitterness from the rind, but fresh-squeezed works too. The acidity in the lemon juice also helps balance the richness of the butter and sugars, creating that perfect harmony of flavors in every bite.

In a separate bowl, whisk together the ½ cup all-purpose flour, ½ teaspoon baking powder, 2 teaspoons ground cinnamon, ½ teaspoon ground nutmeg, and ¼ teaspoon salt. Sift the flour first if possible—this prevents lumps and ensures a lighter texture. The nutmeg adds warmth while the cinnamon brings that classic apple spice flavor. Don't skip sifting; it makes all the difference in a small-batch cake.

Set the dry mixture aside while you prepare the wet ingredients. This separation ensures you don't accidentally overmix the batter, which can make the cake dense. Remember, we're working with a small quantity, so precision matters more than in larger recipes.

In a microwave-safe mug (or small mixing bowl), melt the ¼ cup unsalted butter in 15-second intervals until fully liquid but not hot. Let it cool slightly, then whisk in the ¼ cup granulated sugar, ¼ cup packed brown sugar, 1 whole large egg, and 1 teaspoon vanilla extract until smooth. The butter should be warm to the touch but not hot—this helps emulsify the sugars and creates a tender crumb.

Add the dry ingredients in two parts, mixing just until combined after each addition. Overmixing develops gluten, which can make the cake tough. You're looking for a smooth, thick batter that coats the back of a spoon. If it looks too thick, add 1 teaspoon of milk or water to loosen it slightly.

Gently fold the prepared apple mixture into the batter using a rubber spatula, being careful not to deflate the air bubbles you've incorporated. The apples should be evenly distributed throughout the batter. Pour the batter into a 6-inch microwave-safe mug or small ovenproof dish. Sprinkle the remaining ¼ cup granulated sugar evenly over the top—this creates a caramelized crust during baking.

Here's the thing—don't overthink the folding. You want the apples visible in every bite, so just make sure they're distributed evenly. The sugar on top isn't just for looks; it helps create that beautiful caramelized crust that makes this cake irresistible.

Place the mug in the microwave and bake on high power for 2 minutes and 30 seconds. Immediately after microwaving, transfer the mug to a wire rack and let it cool for 2 minutes. Then, invert the cake onto a plate to reveal the caramelized bottom—this is the moment that matters. The cake should be golden on top with a slightly crisp exterior.

For an oven-baked version, preheat your oven to 350°F and bake for 20-25 minutes until a toothpick inserted into the center comes out clean. The oven method gives you more control over the texture, but the microwave version is perfect for quick single servings. Either way, the result is a moist, spiced apple cake with a perfect balance of sweet and tart flavors.

While the cake is still warm, whisk together the ¼ cup powdered sugar and 1 tablespoon fresh lemon juice until smooth. Drizzle the glaze over the top of the cake and let it drip down the sides. This step adds a bright, citrusy contrast to the warm spices and caramelized sugar. The glaze should be thick enough to coat the back of a spoon but thin enough to drizzle easily.

Let the cake cool completely before serving. The glaze will set as it cools, creating a beautiful finish that ties all the flavors together. This glaze isn't just for decoration—it cuts through the richness of the cake and enhances the apple flavor with its acidity. Trust me, it's worth the extra step.

Perfect pairings for this 6 inch apple cake

Creamy Pairings

This apple cake pairs beautifully with vanilla ice cream—the cool, creamy texture contrasts perfectly with the warm spices. I recommend Breyers Vanilla Bean or Ben & Jerry's Phish Food for a nostalgic twist. The ice cream melts slightly into the cake, creating a decadent dessert experience that feels like a restaurant treat. 🍦

Coffee Complements

A cup of hot coffee enhances the cake's spiced flavors, especially if you use a dark roast like Peet's Major Dickason's Blend. The bitterness of the coffee balances the sweetness, while the warmth of the drink makes the cake feel extra cozy. For an iced version, try Starbucks Pike Place Roast with a splash of milk for creaminess.

Cheese Board Twist

Turn this into a dessert-inspired cheese board by pairing it with aged cheddar and sharp gouda. The salty, tangy cheese cuts through the sweetness, while honeycomb drizzle adds another layer of flavor. Add crackers or baguette slices for crunch, and you've got a sophisticated dessert spread that's perfect for sharing.

Seasonal Fruit Additions

In fall, add sliced pear or cranberry sauce to complement the apple flavors. In summer, try strawberry shortcake with a dollop of whipped cream. The fruit adds freshness and balances the cake's richness, making it feel like a seasonal celebration every time. 🍓

Boozy Upgrades

For an adult twist, drizzle the cake with caramel sauce infused with bourbon or apple brandy. A splash of Baileys Irish Cream over the ice cream adds a luxurious touch. If you prefer wine, a demi-sec champagne pairs beautifully with the cake's sweetness, creating a dessert that feels special without being overly complicated.

Frequently asked questions