Name: Whole Orange & Chocolate Sourdough Protein Cake (Jaffa-Inspired) Recipe
Prep time: 30 min
Cook time: 40 min
Total time: 2 h 35 min
Cuisine: American
Ingredients: 1 small navel orange (about 250 grams); ¼ cup (60 ml) Greek yogurt; 1 scoop (30 g) vanilla whey protein concentrate; ½ cup (100 g) sourdough discard; 6 tablespoons (85 g) unsalted butter, room temperature, plus more for greasing; ½ cup (100 g) granulated sugar; 2 large eggs, room temperature; 1 cup (120 g) all-purpose flour; 1 teaspoon baking powder; 1 teaspoon baking soda; ½ teaspoon kosher salt; 2 oranges; 4 tablespoons (45 g) sugar; 2-3 teaspoons gelatin powder; 2-3 tablespoons water (for gelatin bloom); 150 g dark chocolate (chips or chopped); 1.5 teaspoons coconut oil

Jump to Recipe· 3.9 from 14 reviews

If you are looking for a truly unique treat that dazzles the senses and surprises with wholesome ingredients, the Whole Orange & Chocolate Sourdough Protein Cake (Jaffa-Inspired) Recipe is your golden ticket. Imagine biting into a moist, fluffy cake bursting with the vibrant citrus flavor of whole oranges, infused with protein-packed sourdough discard for a tender crumb, then enveloped in a decadent dark chocolate topping that perfectly captures that nostalgic Jaffa orange-chocolate combo we all love. This cake marries health and indulgence effortlessly, making it the perfect share-worthy centerpiece for any gathering or a guilt-free personal indulgence that feels like a warm hug.

Ingredients You'll Need

The image shows a square cake with two visible layers on a white marbled surface: a thick, soft, yellow layer at the bottom and a smooth, shiny dark chocolate layer on top with wavy lines. Around the cake, there is a slice of bright orange fruit adding color contrast. In the background, there are more slices of the yellow cake with a similar texture. The scene is bright and focused on the cake pieces. Photo taken with an iphone --ar 4:5 --v 7

Gathering your ingredients is straightforward, yet each one plays a crucial role in building the layers of flavor, texture, and color that define this cake. From the bright zing of fresh oranges to the creamy richness of butter and the uplifting power of whey protein, every element has been thoughtfully chosen to create a harmonious whole.

Small navel orange (about 250 grams): This whole fruit adds natural sweetness, moisture, and vibrant citrus aroma throughout the cake.
Greek yogurt (¼ cup/60 ml): Provides creamy tanginess and keeps the crumb tender and moist.
Whey concentrate protein powder (1 scoop/30g, vanilla ideal): Boosts protein content while subtly reinforcing the orange flavor.
Sourdough discard (½ cup/100g): Adds lift, gentle tang, and a beautiful crumb thanks to remaining gluten strands.
Unsalted butter (6 tablespoons/85 grams, room temperature): Imparts richness and helps achieve a light, fluffy sponge.
Granulated sugar (½ cup/100 grams): Balances citrus acidity with sweetness and aids in creaming for volume.
Large eggs (2, room temperature): Provide structure, moisture, and richness essential for the cake’s stability.
All-purpose flour (1 cup/120 grams): Forms the backbone of the batter while keeping the cake tender.
Baking powder (1 teaspoon): Gives the cake an extra boost of rise and lightness.
Baking soda (1 teaspoon): Reacts with the acidity from sourdough and yogurt to add lift and softness.
Kosher salt (½ teaspoon): Enhances all other flavors without overpowering.
Additional oranges (2): Required for the fresh, zesty homemade orange jelly layer.
Sugar for jelly (4 tablespoons/45 grams): Sweetens and helps gel the jelly layer perfectly.
Gelatin (2–3 teaspoons): Sets the orange jelly firmly yet with a delightful wobble.
Dark chocolate (150 grams): The finishing touch that creates a silky, rich coat reminiscent of classic Jaffa slices.
Coconut oil (1.5 teaspoons): Smooths the chocolate glaze for shiny, luscious coverage.

How to Make Whole Orange & Chocolate Sourdough Protein Cake (Jaffa-Inspired) Recipe

Step 1: Prepare Your Workspace and Tools

Before diving in, make sure all ingredients are at room temperature to ensure smooth mixing and a tender crumb. Preheat your oven to 350°F (175°C). Butter an 8-inch baking pan and line it with parchment paper carefully cut to fit, allowing a neat overhang for easy lifting of the cake later.

Step 2: Blend the Whole Orange and Protein Base

Start by trimming the ends of your small navel orange, roughly chopping it with the peel on but removing any seeds. Blend until silky smooth like applesauce. Mix in Greek yogurt and whey protein powder until perfectly smooth with no lumps. This vibrant orange-protein base sets the flavor foundation.

Step 3: Incorporate the Sourdough Discard

Gently fold in the sourdough discard by hand to preserve those gluten strands that will help your cake rise naturally and maintain a satisfying texture. Resist the urge to overblend here for the fluffiest results.

Step 4: Cream Butter and Sugar

Using a hand mixer, cream the softened butter with granulated sugar until light and airy. This step injects volume and gives the cake its irresistible softness. Add eggs one at a time, whisking well after each addition for a perfectly emulsified batter.

Step 5: Combine Orange Mix with Butter Mixture

Slowly mix in your luscious orange and protein blend with the creamed butter and sugar. It may look a little odd or “split” at first, but don’t worry—once dry ingredients are added, the batter will smooth out.

Step 6: Add Dry Ingredients and Batter Preparation

In a separate bowl, whisk together flour, baking powder, baking soda, and salt. Gradually add to wet ingredients, mixing just until combined to avoid overworking the gluten. Your batter should smell delightfully of marmalade with a creamy, fluffy texture.

Step 7: Bake the Cake

Pour the batter into the prepared pan, gently smooth the top, and tap on your counter to release air bubbles. Bake for 30 to 40 minutes until golden and a toothpick comes out with only a few moist crumbs. Let the cake cool in the pan for 5 to 10 minutes, then lift it out using the parchment overhang onto a cooling rack to cool completely—but keep the parchment on for now.

Step 8: Make the Fresh Orange Jelly

While the cake bakes, prepare your orange jelly. Zest the two extra oranges into a saucepan, then peel and chop the flesh, blending it smooth. Heat gently with sugar until dissolved. Bloom gelatin in water, melt it briefly, then blend into the warm orange mix. Pour into a parchment-lined pan and chill until firm—this will become a zesty, tender jelly layer.

Step 9: Assemble Jelly Layer on Cake

Once set, gently unmold the orange jelly and flip it onto the cooled cake, fitting it snugly. Peel off parchment from jelly and cake top. Place back into the baking pan and chill in the freezer briefly to firm the layers for glazing.

Step 10: Melt and Glaze with Chocolate

Melt two-thirds of your dark chocolate with coconut oil gently, stirring carefully to avoid scorching. Temper by adding the remaining chocolate to create a glossy finish. Pour the tempered chocolate over the cold cake and spread quickly with a spatula before it sets, creating an indulgent, shiny coating. Let the chocolate firm up naturally at room temperature.

How to Serve Whole Orange & Chocolate Sourdough Protein Cake (Jaffa-Inspired) Recipe

The image shows multiple square pieces of cake with two layers: a bottom layer of moist, orange-colored cake and a top layer of smooth, dark chocolate with wavy lines on the surface. The pieces are placed on crumpled parchment paper. Bright orange slices are placed around the cake squares, adding a fresh, vibrant contrast. The whole scene is set on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Enhance each slice with a sprinkle of finely grated orange zest for a bright pop or a light dusting of powdered sugar for an elegant touch. Fresh mint leaves add a refreshing contrast to the rich chocolate.

Side Dishes

This cake pairs beautifully with a scoop of vanilla bean ice cream or a dollop of lightly whipped cream. If you prefer something lighter, a cup of strong black coffee or freshly brewed Earl Grey tea complements the citrus and chocolate flavors perfectly.

Creative Ways to Present

For a stunning presentation, serve the cake in neat squares on a platter adorned with slices of fresh orange and shards of tempered chocolate. Alternatively, create individual portions in clear dessert cups layering cake with orange jelly cubes and whipped cream for a playful twist on the traditional slice.

Make Ahead and Storage

Storing Leftovers

Keep leftover slices wrapped tightly in plastic wrap or in an airtight container at room temperature for up to two days to maintain freshness and moisture. Refrigeration can dry the cake, so avoid unless your kitchen is very warm.

Freezing

To preserve your cake longer, wrap tightly in plastic wrap and place inside a freezer-safe container. Freeze for up to one month. Thaw overnight in the refrigerator for well-preserved texture and flavor.

Reheating

This cake is best enjoyed cold or at room temperature because of its jelly and chocolate layers. If you desire a warmer slice, gently warm a piece in your hand rather than in a microwave to avoid melting the chocolate and softening the jelly layer.

FAQs

Can I use a different type of protein powder in this recipe?

Absolutely! While vanilla whey concentrate works wonderfully, you can experiment with plant-based or unflavored powders. Just ensure they blend smoothly and complement the orange flavor to keep the texture delightful.

What if I don’t have sourdough discard on hand?

While sourdough discard adds unique tang and lift, you could try substituting with an equal amount of yogurt or buttermilk. However, the texture might vary slightly as sourdough gluten strands aid in rising.

How do I know when the orange jelly is set properly?

Give it a gentle tap with your finger—if the jelly is firm to the touch and doesn’t stick, it’s ready. It should have a slight wobble but hold its shape nicely when lifted out of the pan.

Can I make this cake gluten-free?

Yes, by replacing all-purpose flour with a suitable gluten-free flour blend and ensuring your protein powder and baking agents are gluten-free, you can enjoy a similar cake. Texture and rise may differ, so bake times might need slight adjustment.

Why does the batter sometimes look like it’s splitting?

This happens when wet and fat components begin to separate temporarily. It’s normal and usually resolves after adding dry ingredients and mixing gently. Keeping ingredients at room temperature helps reduce this effect.

Final Thoughts

I truly hope you fall in love with the Whole Orange & Chocolate Sourdough Protein Cake (Jaffa-Inspired) Recipe as much as I have. It’s a joyous celebration of fresh, wholesome ingredients that don’t compromise on indulgence. This cake uniquely blends nutrition, bright citrus, and rich chocolate to deliver a memorable treat perfect for any occasion. So go ahead, grab those oranges, and give this vibrant recipe a whirl—you won’t regret a single bite.