This cinnamon swirl protein cake is soft, moist, and filled with warm cinnamon flavor. A simple vanilla cake batter is layered with a sweet cinnamon swirl and finished with a light vanilla glaze.
It’s an easy homemade cake for breakfast, brunch, an afternoon snack, or dessert. The cinnamon filling creates beautiful swirls throughout the cake while Greek yogurt and protein powder add extra richness and structure.
Serve it slightly warm with coffee or let it cool completely for a soft, tender slice.
Why You’ll Love This Cinnamon Swirl Protein Cake
- Soft and moist texture
- Warm cinnamon flavor
- Easy homemade cake
- Protein-rich ingredients
- Great for breakfast or dessert
- Perfect with coffee
- Easy to prepare
- Beautiful cinnamon swirl
- Make-ahead friendly
- Delicious warm or chilled
Ingredients
For the Cake
- 1 1/2 cups all-purpose flour
- 1/2 cup vanilla protein powder
- 1/2 cup granulated sugar
- 1 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 2 large eggs
- 3/4 cup plain Greek yogurt
- 1/3 cup unsalted butter, melted
- 1/2 cup milk
- 2 teaspoons vanilla extract
For the Cinnamon Swirl
- 1/3 cup brown sugar
- 1 1/2 teaspoons ground cinnamon
- 2 tablespoons all-purpose flour
- 2 tablespoons melted butter
For the Vanilla Glaze
- 1/2 cup powdered sugar
- 1–2 tablespoons milk
- 1/2 teaspoon vanilla extract
How to Make Cinnamon Swirl Protein Cake
1. Preheat the Oven
Preheat your oven to 350°F.
Grease an 8-inch square baking pan and line the bottom with parchment paper.
Leave a little parchment hanging over two sides to make the finished cake easier to lift from the pan.
2. Prepare the Dry Ingredients
Add flour, vanilla protein powder, sugar, baking powder, baking soda, and salt to a medium mixing bowl.
Whisk until evenly combined.
3. Mix the Wet Ingredients
In a separate bowl, whisk together the eggs, Greek yogurt, melted butter, milk, and vanilla extract.
Mix until smooth.
4. Combine the Batter
Pour the wet ingredients into the dry ingredients.
Gently stir until just combined.
Don’t overmix the batter.
A few small lumps are fine.
5. Make the Cinnamon Swirl
Add brown sugar, cinnamon, flour, and melted butter to a small bowl.
Stir until the mixture forms a thick, crumbly paste.
6. Layer the Batter
Spread about half of the cake batter into the prepared baking pan.
Use a spatula to create an even layer.
7. Add the Cinnamon Filling
Sprinkle or gently spread the cinnamon mixture over the batter.
Try to distribute it evenly from edge to edge.
8. Add the Remaining Batter
Spoon the remaining cake batter over the cinnamon layer.
Gently spread it across the surface.
Don’t worry if some of the cinnamon filling remains visible.
9. Create the Swirl
Insert a butter knife into the batter.
Make several gentle zigzag or circular motions through the batter.
Don’t over-swirl.
A few simple passes create more defined cinnamon ribbons.
10. Bake
Place the pan in the preheated oven.
Bake for approximately 30–38 minutes.
The cake is ready when the top is lightly golden and a toothpick inserted into the center comes out with a few moist crumbs.
Avoid overbaking because protein powder can make baked goods dry if they stay in the oven too long.
11. Cool
Remove the cake from the oven.
Let it cool in the pan for about 15 minutes.
Transfer it to a wire rack and allow it to cool further before glazing.
12. Make the Glaze
Whisk powdered sugar, milk, and vanilla extract in a small bowl.
Add the milk gradually until the glaze reaches a smooth, pourable consistency.
13. Glaze the Cake
Drizzle the vanilla glaze over the cooled cake.
Allow the glaze to set for a few minutes.
14. Slice and Serve
Cut the cake into squares.
Serve slightly warm or at room temperature with coffee, tea, or your favorite breakfast drink.
How Do I Get a Good Cinnamon Swirl?
Don’t mix the cinnamon filling completely into the batter.
Instead, create a distinct layer between the cake batter and then make only a few gentle swirls with a knife.
Too much swirling can blend the filling into the cake and make the pattern less visible.
Can I Use a Different Protein Powder?
Yes.
Vanilla whey protein powder works particularly well.
A whey-and-casein blend can also work.
Different protein powders absorb liquid differently, so you may need a small adjustment to the milk depending on the brand.
Can I Use Unflavored Protein Powder?
Yes.
If using unflavored protein powder, increase the vanilla extract slightly or add a little extra cinnamon for more flavor.
Can I Use Whole Wheat Flour?
Yes.
Whole wheat flour can be substituted for part or all of the all-purpose flour.
The cake may have a slightly denser texture and a more pronounced grain flavor.
Can I Use Almond Flour?
Almond flour isn’t a direct one-to-one substitute for all-purpose flour because it behaves differently during baking.
For the most reliable texture, use a recipe specifically formulated around almond flour.
Can I Use Greek Yogurt?
Yes.
Greek yogurt helps add moisture and creates a tender crumb.
Plain Greek yogurt works best.
Easy Cinnamon Swirl Protein Cake Variations
Apple Cinnamon Protein Cake
Add finely diced apple to the cake batter.
Blueberry Cinnamon Protein Cake
Fold fresh blueberries into the batter before layering.
Chocolate Cinnamon Protein Cake
Add a little unsweetened cocoa powder to the batter.
Pecan Cinnamon Protein Cake
Add finely chopped pecans to the cinnamon filling.
Maple Cinnamon Protein Cake
Replace part of the glaze with a light maple-flavored glaze.
Cream Cheese Cinnamon Cake
Add a thin layer of sweetened cream cheese between the cake layers.
Banana Cinnamon Protein Cake
Add mashed ripe banana to the wet ingredients and reduce the milk slightly if necessary.
Can I Add Nuts?
Absolutely.
Chopped pecans or walnuts are especially good with cinnamon.
Add them to the cinnamon filling or sprinkle them over the glaze.
Can I Make This Cake Ahead of Time?
Yes.
The cake can be baked one day ahead.
Allow it to cool completely and store it covered at room temperature.
Add the glaze shortly before serving for the freshest appearance.
How to Store Cinnamon Swirl Protein Cake
Store the cake in an airtight container at room temperature for up to 2 days.
If your kitchen is particularly warm, refrigerate it instead.
Bring refrigerated slices closer to room temperature before serving for a softer texture.
Can I Freeze This Cake?
Yes.
Allow the cake to cool completely before freezing.
Wrap individual slices tightly and place them in a freezer-safe container.
Freeze for up to 2 months.
For the best result, freeze the cake without the glaze and add fresh glaze after thawing.
How to Thaw the Cake
Place frozen slices in the refrigerator overnight or allow them to thaw at room temperature for several hours.
Warm individual slices briefly before serving if desired.
Why Is My Protein Cake Dry?
Protein powder absorbs liquid differently from regular flour.
Overbaking can also make protein-based cakes dry.
Measure ingredients carefully and remove the cake once a toothpick comes out with a few moist crumbs.
Why Didn’t My Cake Rise?
Check that your baking powder and baking soda are fresh.
Also avoid overmixing the batter after combining the wet and dry ingredients.
Protein powder can make the batter slightly heavier than a traditional cake batter.
What Can I Serve With This Cake?
Try serving it with:
- Coffee
- Black tea
- Greek yogurt
- Fresh berries
- Sliced banana
- Unsweetened whipped cream
- Chopped pecans
- A light drizzle of glaze
Frequently Asked Questions
Is cinnamon swirl protein cake a healthy dessert?
This recipe uses protein powder and Greek yogurt, but it is still a baked dessert containing sugar and flour. Nutrition depends on the exact ingredients and serving size.
Can I reduce the sugar?
Yes. You can reduce the granulated sugar in the cake, although this may slightly change the texture and sweetness.
Can I use a sugar substitute?
Yes. A suitable baking sweetener can replace some or all of the granulated sugar. Follow the package’s substitution guidance because sweetness varies between products.
Can I make this without protein powder?
Yes. Replace the protein powder with additional flour, although the recipe will no longer have the same protein content or texture.
Can I use chocolate protein powder?
Yes. Chocolate protein powder creates a chocolate-cinnamon variation.
Can I make muffins instead?
Yes. Divide the batter into a lined muffin pan and reduce the baking time. Begin checking them early.
Can I make this dairy-free?
Use dairy-free yogurt, milk, butter, and a suitable dairy-free protein powder.
Can I make this gluten-free?
Use a suitable gluten-free flour blend and verify that your protein powder is gluten-free.
Recipe Card
Cinnamon Swirl Protein Cake
Prep Time: 15 minutes
Cook Time: 30–38 minutes
Total Time: About 50 minutes
Servings: 9
Course: Breakfast / Dessert
Cuisine: American
Ingredients
Cake
- 1 1/2 cups all-purpose flour
- 1/2 cup vanilla protein powder
- 1/2 cup granulated sugar
- 1 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 2 large eggs
- 3/4 cup plain Greek yogurt
- 1/3 cup melted butter
- 1/2 cup milk
- 2 teaspoons vanilla extract
Cinnamon Swirl
- 1/3 cup brown sugar
- 1 1/2 teaspoons cinnamon
- 2 tablespoons flour
- 2 tablespoons melted butter
Glaze
- 1/2 cup powdered sugar
- 1–2 tablespoons milk
- 1/2 teaspoon vanilla
Instructions
- Preheat oven to 350°F.
- Grease and line an 8-inch square baking pan.
- Whisk flour, protein powder, sugar, baking powder, baking soda, and salt.
- Whisk eggs, Greek yogurt, melted butter, milk, and vanilla separately.
- Combine wet and dry ingredients until just mixed.
- Combine brown sugar, cinnamon, flour, and melted butter for the swirl.
- Spread half the cake batter into the pan.
- Add the cinnamon mixture.
- Cover with remaining batter.
- Gently swirl with a butter knife.
- Bake for 30–38 minutes.
- Cool for 15 minutes in the pan.
- Whisk together the glaze ingredients.
- Drizzle glaze over the cooled cake.
- Slice and serve.