One-Bowl Orange Slice Cake with a Crunchy Sugar Topping

This Orange Slice Cake is the kind of simple, buttery dessert that comes together in one bowl and fills the kitchen with the warm scent of citrus.

Thin orange slices bake right into the top, creating a caramelized, crackly sugar crust that contrasts with the soft, tender crumb underneath. It’s sturdy enough for a lunchbox, yet pretty enough to serve guests with a dusting of powdered sugar.

Why This Cake Stays in the Rotation

The sugar you sprinkle beneath the oranges doesn’t just sweeten them; it melts into a thin, shiny crust that shatters a little when you bite in. Beneath it, the crumb is damp and almost pudding-soft from the juice the oranges release as they bake.

Every bite has that sticky, citrusy top and a lot of buttery cake. I love that it tastes like something that took hours, but the batter comes together with a wooden spoon and a single bowl, no mixer needed.

Ingredients

• 1 1/2 cups all-purpose flour: spooned and leveled, not scooped
• 2 tsp baking powder:
• 1/2 tsp salt:
• 3/4 cup granulated sugar: for the cake batter
• 2 tbsp granulated sugar: for the crunchy topping
• 1/2 cup unsalted butter, melted and slightly cooled:
• 2 large eggs, at room temperature: cold eggs will make the batter seize
• 1 tsp vanilla extract:
• 1/2 cup whole milk, at room temperature:
• 1 large navel orange: thinly sliced into about 8 rounds, seeds removed (no need to peel)

Variations / Substitutions

• Blood oranges or cara cara oranges: any thin-skinned eating orange works; they all give a slightly different pink-orange hue and a slightly tarter note.
• Orange zest boost: rub a teaspoon of finely grated orange zest into the 3/4 cup sugar before mixing to deepen the citrus flavor without changing the texture.
• Almond extract: swap the vanilla for 1/2 tsp almond extract for a nutty, bakery-shop aroma (a little goes a long way).
• Greek yogurt: replace the milk with an equal amount of plain whole-milk Greek yogurt for a slightly tangier, even moister crumb.

If you like this kind of fuss-free citrus cake, our Lemon Drizzle Loaf recipe is another good one to have in your pocket.

How to Make Orange Slice Cake

Step 1: Mix the Batter

Preheat your oven to 350°F (175°C). In a large bowl, whisk together the 1 1/2 cups flour, 2 tsp baking powder, 1/2 tsp salt, and the 3/4 cup sugar. Pour in the melted butter, eggs, vanilla, and milk. Stir with a wooden spoon or a flexible spatula just until no streaks of flour remain, about 20 to 30 strokes. A few small lumps are fine; overmixing will make the cake tough.

The batter will be thick but pourable, almost like a soft buttercream. When you lift the spoon it should fall off in a ribbon that slowly settles back into the bowl.

Step 2: Layer the Oranges and Sugar

Butter an 8-inch round cake pan generously, getting into the corners. Arrange the orange slices in a single layer on the bottom of the pan, overlapping slightly if needed to cover the surface. Sprinkle the 2 tbsp sugar evenly over the oranges. It may seem like a lot, but this is what turns into the crackly top.

As the cake bakes, those orange rounds will soften and release their juice, which mixes with the sugar to form a syrupy, sticky glaze right against the pan. That glaze becomes the crunchy top once the cake is flipped.

Step 3: Bake the Cake

Pour the batter over the oranges and gently spread it to the edges with the back of your spoon. Tap the pan once on the counter to release any large air bubbles. Bake on the middle rack for 40 to 45 minutes. The cake is done when the top is golden and a toothpick inserted in the center comes out clean, with maybe a few moist crumbs attached.

You will smell the sugar caramelizing around the edges at about the 30-minute mark. The surface will rise and dome slightly, then settle as it cools.

Step 4: Invert and Serve

Let the cake cool in the pan on a wire rack for 10 minutes. Run a thin knife around the edge, then place a serving plate upside down on top of the pan and flip the whole thing over. Lift the pan away slowly so the oranges stay intact. The sugar crust should now be facing up, shiny and slightly firm. Slice and serve warm, with a cold glass of milk or a cup of black tea.

If any orange slices stick to the pan, just nudge them back onto the cake with a small offset spatula. The top will still look rustic and beautiful.

A Few Notes Before You Start

• Slice the orange as evenly as you can, about 1/4 inch thick. A serrated bread knife does a cleaner job than a chef’s knife on soft citrus.
• Room-temperature eggs and milk really do matter here. Cold liquids can firm up the melted butter and give you a heavy, dense texture instead of a tender crumb.
• Don’t skip the 10-minute rest in the pan. The cake is too fragile to turn out straight from the oven, but if it sits much longer the sugar can seize and stick to the pan.
• An 8-inch pan gives you a taller cake with a longer bake; a 9-inch round will work but the cake will be thinner. See the table below for timing.

Bake times by pan size:

Storing Leftover Cake

• Refrigerate: This cake stays moist for up to 4 days covered at room temperature, but if your kitchen is warm, slide it into the fridge in an airtight container. The sugar crust will soften in the fridge; a quick 5-minute spell in a 300°F oven brings the crunch back.
• Reheating: Warm individual slices in a toaster oven or dry skillet over low heat until the top feels tacky again.
• Serve cold: It’s lovely straight from the fridge, though the crust will be more chewy than crunchy.

Frequently Asked Questions

Can I use canned mandarin oranges instead of fresh?

Yes, but pat them very dry first. Canned segments hold more liquid and can make the cake soggy. The sugar crust will also be softer.

Why did my cake stick to the pan?

The orange slices and sugar create a sticky layer that grabs onto the pan if it’s not buttered thoroughly. Grease the pan well and use a nonstick pan if you have one, then invert while the cake is still warm, never cold.

Can I make this dairy-free?

Swap the butter for a neutral oil like canola and use oat milk in place of whole milk. The cake will still be moist, though the flavor will be slightly less rich.

What if I don’t have a round pan?

A square 8×8-inch pan works too. The bake time will be close to the 8-inch round pan, about 35 to 40 minutes, and you can cut bars instead of slices.

Can I add a glaze instead of the crunchy sugar?

You can, but the sugar crust is what makes this cake special. A simple powdered sugar and orange juice glaze drizzled over the top after flipping would work if you want more sweetness, but the texture will be different.

Orange Slice Cake Recipe

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Prep Time 15 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr

Servings: 8 servings

Calories: 280

Ingredients Method Notes

Ingredients

  

• 1 1/2 cups all-purpose flour
• 2 tsp baking powder
• 1/2 tsp salt
• 3/4 cup granulated sugar
• 2 tbsp granulated sugar
• 1/2 cup unsalted butter, melted and slightly cooled
• 2 large eggs, at room temperature
• 1 tsp vanilla extract
• 1/2 cup whole milk, at room temperature
• 1 large navel orange

Method

 

1. Preheat oven to 350°F. Whisk flour, baking powder, salt, and 3/4 cup sugar in a large bowl. Stir in melted butter, eggs, vanilla, and milk until just combined.
2. Butter an 8-inch round cake pan. Arrange orange slices in a single layer on the bottom and sprinkle with 2 tbsp sugar.
3. Pour batter over the oranges and smooth the top. Bake 40 to 45 minutes until golden and a toothpick comes out clean.
4. Cool in the pan for 10 minutes, then invert onto a plate and serve warm or at room temperature.

Notes

The cake will keep for about 4 days at room temperature, but the crunchy sugar top is best the day it’s made. To revive a lost crunch, warm slices in a low oven for 5 minutes. Let the cake cool fully before covering if you plan to store it, or the trapped steam will make the crust tacky.