Strawberry Rhubarb Streusel Muffins with Sour Cream

These tall, fluffy Strawberry Rhubarb Sour Cream Streusel Muffins are full of sweet strawberries and tangy rhubarb in every bite. A buttery sugar streusel is sprinkled on top and crisps as the muffins bake, adding a delightful crunch to the tender crumb.

Using sour cream in the batter yields an extra-soft, tender texture—one of the reasons these muffins are so irresistible.

Light, airy, and perfectly tender, these muffins strike a lovely balance of sweetness and tartness from the fruit and rhubarb.

Ingredients Notes

Below are highlights for the main ingredients. See the recipe card further down for exact measurements and the full ingredient list.

• Butter – Unsalted butter is used for the streusel topping.
• Rhubarb – Bright pink rhubarb looks beautiful, but any color will work. Older rhubarb can be stringy; peel if desired.
• Cornstarch – Optional, but it helps create a tender muffin texture.
• Strawberries – Use fresh strawberries sliced into small pieces so they distribute evenly through the batter.
• Sour cream – The key to the muffins’ tender crumb. Bring it to room temperature before mixing.
• Oil – Neutral-flavored oil works well; it keeps the muffins moist.

Step by step instructions

Follow these steps to make Strawberry Rhubarb Sour Cream Streusel Muffins.

Step 1 – Prep. Preheat the oven to 375°F (190°C). Line a 12-cup muffin tin with liners and set aside. Melt the butter for the streusel and let it cool while you prepare the other ingredients.

Step 2 – Make the streusel. In a medium bowl combine the flour, white sugar, and cold butter. Use your hands or a pastry cutter to work the butter into the dry ingredients until crumbly. Chill the streusel in the refrigerator while you make the batter.

Step 3 – Prepare the fruit. Wash and dry the strawberries and rhubarb, then slice both into roughly 1/4-inch pieces. Place them in a bowl and set aside.

Step 4 – Combine dry ingredients. In a bowl whisk together the flour, cornstarch (if using), baking soda, and baking powder. Set aside.

Step 5 – Whisk wet ingredients. In a large bowl whisk the sugar, oil, eggs, vanilla, and sour cream until smooth and well combined, about 2–3 minutes.

Step 6 – Combine wet and dry. Gently fold the dry ingredients into the wet mixture with a spatula, stopping when most of the flour is incorporated; a few streaks of flour are fine.

Step 7 – Dust the fruit. Sprinkle 1 tablespoon of flour over the strawberries and rhubarb and toss to coat evenly. This helps the fruit stay suspended in the batter rather than sinking.

Step 8 – Add the fruit. Fold the floured fruit into the batter until evenly distributed and there are no visible flour streaks.

Step 9 – Scoop and top. Divide the batter evenly among the prepared muffin liners. Sprinkle a generous handful of chilled streusel over each muffin.

Step 10 – Bake. Bake at 375°F (190°C) for 25–30 minutes, or until a toothpick inserted into the center of a muffin comes out clean. Let the muffins cool slightly before serving.

Store baked muffins in an airtight container at room temperature for up to 2 days, or refrigerate for up to one week. They are best enjoyed fresh within the first couple of days.

Expert Baking Tips

Useful tips to improve your muffins:

• Mix dry ingredients separately. Combining the dry ingredients first ensures the leavening is evenly distributed so the muffins rise uniformly.
• Don’t over-mix. Stir the batter until the ingredients are just combined. Over-mixing develops gluten and makes the muffins dense instead of tender.

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