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Sourdough cupcakes with vanilla frosting and sprinkles
4.94 from 16 votes

Best Sourdough Discard Vanilla Cupcakes

These vanilla sourdough cupcakes are so moist and tender that they'll be the best cupcakes you've ever eaten. They stay moist for days!
Xena Kai
Prep Time: 10 minutes
Cook Time: 18 minutes
Total Time: 28 minutes
Servings: 16 Cupcakes
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Ingredients
 

For The Cupcakes

  • 1 1/4 Cup (150 g) All Purpose Flour
  • 1 Cup (200 g) Sugar
  • 1/4 Teaspoon (0.25 Teaspoon) Baking Soda
  • 1 1/2 Teaspoon (1.5 Teaspoon) Baking Powder
  • 1/4 Teaspoon (0.25 Teaspoon) Kosher Salt
  • 3/4 Cup (170.25 g) Unsalted Butter Melted
  • 3 (3) Egg Whites
  • 1 Tablespoon (1 Tablespoon) Vanilla Extract
  • 1/2 Cup (115 g) Sour Cream
  • 1/4 Cup (59.15 ml) Whole Milk
  • 1/2 Cup (144 g) Sourdough Discard

For The Vanilla Buttercream Frosting

  • 1 1/2 Cups (340.5 g) Unsalted Butter Room Temperature (three sticks)
  • 3 1/4 Cups (390 g) Powdered Sugar
  • 3/4 Teaspoon (0.75 Teaspoon) Vanilla Extract
  • 1 1/2 Tablespoon (1.5 Tablespoon) Heavy Cream
  • 1/4 Teaspoon (0.25 Teaspoon) Kosher Salt

Instructions
 

For The Cupcakes

  • Preheat oven to 350°F. Place the cupcake liners in the cupcake pan.
  • Sift the dry ingredients (flour, sugar, baking soda, baking powder and salt) into a large mixing bowl. Whisk together.
  • In a medium bowl, add the wet ingredients (melted butter, egg whites, vanilla extract, sour cream, milk and sourdough discard). Whisk together until combined.
  • Add the wet ingredients into the bowl of dry ingredients. Mix until combined.
  • Fill the cupcake liners ⅔ of the way full.
  • Bake for 18 minutes or until the tops of the cupcakes are springy to the touch.

For The Vanilla Buttercream Frosting

  • Place the room temperature butter in the bowl of a stand mixer. Using the paddle attachment, cream on medium speed for one to two minutes.
  • Add the powdered sugar in batches. Then, add salt, heavy cream and pure vanilla extract. Mix until fluffy.
  • Transfer the frosting into a piping bag. Pipe the vanilla buttercream on each cupcake

Notes