These Raspberry Lime Cupcakes are so pretty and have such a fun flavor combo. They start with moist vanilla cupcakes with a fresh hint of lime, then they're frosted with raspberry buttercream made from fresh berries.
Preheat the oven to 350F degrees & line 2 muffin trays with muffin papers. You'll end up with around 16 cupcakes.
In a medium bowl sift together the flour, cornstarch, baking powder and salt.
1 1/4 Cup All-Purpose Flour, 1/4 Cup Cornstarch, 2 teaspoons Baking Powder, 1/2 teaspoon Salt
Then in a separate large bowl beat the butter and sugar together until fluffy.
1/2 Cup Butter, 3/4 Cup Granulated Sugar
Beat in the lime zest, vanilla, large egg & egg whites until evenly combined.
1 teaspoon Vanilla Extract, 1 Tablespoon Lime Zest, 1 Large Egg, 2 Large Egg Whites
With the mixer turned to low speed beat in the sour cream and 2 tablespoons of lime juice, followed by the flour mixture.
2 Tablespoons Lime Juice, 1/3 Cup Sour Cream
Finally, beat in the milk.
1/4 Cup Milk
Turn off the mixer and scrape down the sides of the bowl as necessary, and be careful not to over mix the batter.
Spoon the batter into the prepared muffin pan, filling each about 2/3 to 3/4 full.
Bake in your preheated oven for 15-18 minutes or until an inserted toothpick comes out clean.
Allow to cool, and brush the top of each cupcake with the remaining 1 tablespoon of lime juice. (1 tablespoon of lime just divided between all the cupcakes.
1 Tablespoon Lime Juice
Raspberry Frosting
Puree the raspberries in a blender or food processor until smooth.
1 1/2 Cups Raspberries
Then strain through a sieve to remove the seeds. This is optional but recommended.
Transfer the puree to a small saucepan and allow it to come to a gently boil as you gently stir the mixture.
Let it boil for about 10-20 minutes, or until the mixture becomes thick and is about 1/4 to 1/3 of the original volume.
Then place in the fridge or freezer to cool completely.
In a large bowl beat the butter until it's fluffy and lightened in colour, then turn the mixer down to low speed and beat in 2 cups of the powdered sugar.
1 Cup Unsalted Butter, 4 Cups Powdered Sugar
Ensure that your raspberry puree is completely cold (it cannot be even a little warm, otherwise the frosting will separate) then beat in 2-3 tablespoons.
Finally, beat in the rest of the powdered sugar and 1 tablespoon of whipping cream if needed or a little extra powdered sugar.
1 Tablespoon Whipping Cream
Frost the cooled cupcakes with a piping bag or knife
Notes
Cupcakes will keep for about 3 days in the pantry.