Preheat the oven to 350 degrees F. Place the cupcake liners in the cupcake tin and set it aside. In a medium bowl, sift together all-purpose flour, unsweetened cocoa powder, and salt and mix until combined. Set the dry ingredients to the side.
140 grams all-purpose flour, 3 grams unsweetened cocoa powder, 3 grams salt
In a large mixing bowl, whisk the milk, sourdough discard, almond/vanilla extract, and red food coloring, if desired, until smooth.You can us active sourdough starter, just be sure to use the same amount in grams. 120 grams milk, 120 grams sourdough discard, 2 grams vanilla or almond extract, red food coloring
In a bowl of a stand mixer fitted with a paddle attachment, cream the room temperature unsalted butter and sugar until creamy on medium speed, about 2 minutes. Stop to scrape the bottom and sides of the bowl when necessary. 57 grams unsalted butter, room temperature, 175 grams sugar
To the butter mixture, add the beaten egg. Beat on medium speed until the mixture is fluffy and a pale yellow color, about 2-3 minutes.
1 large egg
Now, alternate adding the dry and wet ingredients to the stand mixer.
First add a third of the flour mixture, followed by half of the liquid ingredients. Be sure not to over-mix the cake batter! This can lead to a tough crumb. Stop mixing once the flour mixture is just combined.
In a small bowl, mix the baking soda and vinegar. It will bubble and fizz. Fold this into the batter. You will notice the batter will look fluffy.
3 grams baking soda, 2 grams white vinegar
Pour the batter into the cupcake liners, about 2/3 of the way full.
Place the cupcake tin into the oven on the middle oven rack. Bake for 16-18 minutes, or until a toothpick comes out clean from the center of the cupcakes.
Leave the Sourdough Red Velvet Cupcakes into the cupcake tin for 5 minutes, then remove and cool on a wire rack completely before frosting.