Ingredients
Cupcake Batter
- 210 g cake flour
- 200 g granulated sugar
- 1/2 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp salt
- 80 g butter
- 240 g sour cream (room temperature)
- 2 large eggs (room temperature)
- 1 tbsp vegetable oil
- 1 ½ tsp vanilla extract
- 100 g fresh blueberries
- 1 tsp cornstarch
Blueberry Buttercream
- 150 g butter (cool room temperature)
- 250 g powdered sugar
- 2 tbsp smooth blueberry jam (strained if chunky)
- Fresh blueberries (for decoration)
Instructions
- Preheat and prepare: Preheat the oven to 160ºC (320ºF) using the conventional oven setting, and line a 12-cup cupcake tray with cupcake liners for easy removal and baking.
- Mix dry ingredients: In a large bowl, combine cake flour, granulated sugar, baking powder, baking soda, and salt, mixing thoroughly to evenly distribute all dry components.
- Incorporate butter: Add the butter and mix with a hand or stand mixer using the paddle attachment until the mixture looks sandy and crumbly, indicating the butter is well coated with the dry ingredients.
- Combine wet ingredients: In a separate bowl, whisk together sour cream, eggs, vegetable oil, and vanilla extract until fully combined and smooth.
- Blend wet and dry mixtures: Pour the wet mixture into the dry ingredients, then beat with an electric mixer until the batter is smooth and lump-free.
- Prepare blueberries: Toss the fresh blueberries gently with cornstarch to prevent them from sinking during baking, then carefully fold them into the batter to evenly distribute.
- Fill cupcake liners and bake: Divide the batter evenly among the 12 cupcake liners, then bake for 22-23 minutes until a toothpick inserted in the center comes out clean.
- Cool cupcakes: Let the cupcakes cool in the pan for 5 minutes before gently removing them to a wire rack to cool completely, ensuring they do not become soggy.
- Prepare buttercream sugar: Sift the powdered sugar to remove any lumps and set aside for frosting preparation.
- Whip butter: Using a mixer with paddle attachment, whip the butter on medium/high speed for 4 minutes until light and creamy. Scrape down the bowl sides and whip for an additional 2 minutes.
- Add sugar and jam: Add the powdered sugar and blueberry jam in two additions, mixing thoroughly after each to incorporate fully. If jam is chunky, strain first for a smooth frosting.
- Final mixing: Scrape the bowl sides and mix the buttercream on low speed for 1 minute to achieve a smooth, uniform texture.
- Decorate cupcakes: Transfer the buttercream to a piping bag fitted with a star tip (e.g., Wilton 1M). Pipe the frosting onto cooled cupcakes and top each with fresh blueberries for decoration and added flavor.
Notes
- Make sure all your wet ingredients are at room temperature to ensure smooth blending and even baking.
- Tossing blueberries with cornstarch helps prevent them from sinking to the bottom during baking.
- If your blueberry jam contains berries or seeds, strain it for a smooth buttercream consistency.
- Allow cupcakes to cool fully before frosting for best results.
- You can substitute the sour cream with Greek yogurt to add a slight tang and moisture.
- Prep Time: 15 minutes
- Cook Time: 23 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American