Blueberry Protein Muffins with Buttermilk
These blueberry protein muffins have juicy blueberries, golden tops, and a sprinkle of crunchy sugar. Vanilla protein powder adds protein to a simple muffin batter made with buttermilk and sour cream. You’ll need two bowls and a whisk, and the recipe makes 12 muffins.
Frozen blueberries make these easy to bake any time of year. Enjoy one with your morning coffee, or tuck a cooled muffin into a container for an afternoon snack.
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For another blueberry breakfast, try my Blueberry Cottage Cheese Breakfast Bake with Oats. It bakes in one pan and cuts into squares. If you’re putting together a brunch spread, browse these breakfast potluck ideas for sweet and savory options.
A Quick Look At The Recipe
- 🧁 Yield: 12 muffins
- ⏱️ Prep: 15 minutes
- 🔥 Bake: 18–22 minutes at 375°F (190°C)
- 🕒 Ready in: About 40 minutes, including 5 minutes of cooling in the pan
- 🥣 Method: Mix by hand; no electric mixer needed
- 🫐 Main ingredients: Vanilla protein powder, all-purpose flour, frozen blueberries, buttermilk, and sour cream
Ingredients
The full amounts are in the recipe card below. Here are the details that matter before you start.
- Vanilla protein powder: Use 55 g, measured on a scale. Scoop sizes vary, so weighing is more useful than counting scoops. The powder selected for this recipe is Optimum Nutrition Gold Standard 100% Whey in Vanilla Ice Cream. Other vanilla whey powders may give different results, especially if they contain different sweeteners or thickeners.
- Buttermilk and sour cream: Buttermilk adds liquid and a little tang, while sour cream adds richness. Use plain sour cream, and stir it before measuring if liquid has separated on top.
- Butter and oil: Melted butter adds flavor, while a neutral oil keeps the flavor mild and contributes to a tender crumb. Let the butter cool until it is warm rather than hot before mixing.
- Frozen blueberries: Keep them frozen until you’re ready to fold them in. Break apart any clumps so the berries spread evenly through the batter.
- Coarse sugar: A light sprinkle gives the tops some crunch. It is optional if you prefer a plain muffin top.
How to Make Blueberry Protein Muffins
1. Prepare the pan and dry ingredients
Heat the oven to 375°F (190°C) and line a standard 12-cup muffin pan with paper liners. Whisk the flour, protein powder, baking powder, baking soda, and salt together, breaking up any lumps in the powder.
2. Mix the wet ingredients
In a separate bowl, whisk the melted butter, oil, and sugar. Add the egg, buttermilk, sour cream, and vanilla. Whisk until the mixture looks evenly combined.
3. Combine and add the blueberries
Add the dry mixture to the wet ingredients. Fold gently with a spatula, stopping as soon as the flour is incorporated. The batter should be thick enough to scoop, as shown in the process photos.
Toss the frozen blueberries with the extra flour, then fold them into the batter with a few gentle turns. A little purple streaking is fine. Don’t keep stirring to make the color even.
4. Divide and bake
Divide the batter evenly among all 12 liners. A cookie scoop makes this easier. Distribute any remaining batter between the liners before adding the coarse sugar.
Bake for 18–22 minutes, checking at 18 minutes. Look for golden tops and centers that are set. Insert a toothpick into the crumb rather than through a blueberry; it should come out without wet batter.
5. Cool
Leave the muffins in the pan for 5 minutes, then transfer them to a wire rack. Let them cool further before peeling away the liners, and cool completely before storing.
Tips for a Better Batch
- Weigh the flour and protein powder. Too much of either can make the muffins dry. The extra flour for the berries is separate from the flour in the batter.
- Use a spatula once the flour goes in. Fold just until combined, scraping the bottom of the bowl so no pockets of dry flour remain.
- Check the center, not just the color. A browned top does not always mean the middle is baked.
- Avoid adding extra protein powder. Increasing it changes the balance of the batter and may affect moisture and texture.
Storage and Freezing
Once completely cool, store the muffins in an airtight container at room temperature for up to 2 days, or refrigerate for up to 4 days. In a warm kitchen, choose the fridge.
For longer storage, wrap the cooled muffins individually and freeze in a freezer bag for up to 3 months. Thaw before serving and warm briefly if you like. The sugar topping may soften during storage.
Frequently Asked Questions
Can I use a different protein powder?
Another vanilla whey protein powder may work, but the texture and sweetness can change. Plant-based protein, casein, collagen, and meal-replacement powders are not direct equivalents. Weigh out 55 g rather than using the same number of scoops.
Can I leave out the protein powder?
Leaving it out removes a substantial part of the dry ingredients. This version has not been tested without it, so I would choose a regular blueberry muffin recipe instead of guessing at a replacement.
Why did my muffins turn out dry?
Check your flour and protein powder measurements first, then your baking time. A different powder can also affect the result. Start checking at the early end of the baking range and remove the muffins when the centers are done.
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Blueberry Protein Muffins with Buttermilk
Equipment
- 12 paper muffin liners
- Kitchen scale
- Measuring spoons
- Two mixing bowls
- Whisk and rubber spatula
- Wire cooling rack
Ingredients
- 1 cup all-purpose flour 120 g
- 55 g vanilla whey protein powder Use a scale; scoop sizes vary.
- 1 ¼ teaspoons baking powder approximately 5 g
- ¼ teaspoon baking soda approximately 1.2 g
- ¼ teaspoon fine table salt approximately 1.5 g
- 3 tablespoons salted butter, melted and cooled 43 g
- 2 tablespoons plus 2 teaspoons vegetable oil 36 g
- ½ cup granulated sugar 100 g
- 1 large egg approximately 50 g without the shell
- ½ cup buttermilk 120 g
- ¼ cup sour cream 60 g
- 1 ½ teaspoons vanilla extract approximately 6 g
- ¾ cup frozen blueberries 115 g, kept frozen
- 2 teaspoons all-purpose flour approximately 5 g, for the blueberries
- coarse sanding sugar for sprinkling, optional
Instructions
- Preheat the oven to 375°F (190°C). Line a standard 12-cup muffin pan with paper liners.
- Whisk together the flour, protein powder, baking powder, baking soda, and salt in a mixing bowl.
- In another bowl, whisk the melted butter, oil, and granulated sugar. Add the egg, buttermilk, sour cream, and vanilla. Whisk until evenly combined.
- Add the dry ingredients to the wet mixture. Fold with a spatula just until the flour is incorporated, scraping the bottom of the bowl. Avoid overmixing.
- Toss the frozen blueberries with the extra 2 teaspoons (approximately 5 g) flour. Gently fold them into the batter.
- Divide the batter evenly among the 12 liners. Sprinkle with coarse sugar, if using.
- Bake for 18–22 minutes, checking at 18 minutes. The tops should be golden, and a toothpick inserted into the crumb, away from a blueberry, should come out without wet batter.
- Cool in the pan for 5 minutes, then transfer to a wire rack. Cool completely before storing.
Notes
- Protein powder: Measure by weight. Other vanilla whey powders can affect texture and sweetness. Plant-based powders, casein, collagen, and meal replacements are not direct substitutes.
- Measurements: Gram conversions are approximate. Fine table salt is specified because coarser salts weigh differently by teaspoon.
- Storage: Keep completely cooled muffins airtight for up to 2 days at room temperature or 4 days in the fridge. Freeze individually wrapped muffins for up to 3 months.
- Timing: Total time includes 5 minutes of pan cooling. Allow additional time to cool completely before storing.