Blackberry Lemon Cupcakes Gelson's

Ingredients

• 1 ¾ cups cake flour
• 1 ¼ tsp baking powder
• ½ tsp baking soda
• ¼ tsp kosher salt
• ½ cup whole milk, room temperature
• ½ cup sour cream, room temperature
• 1 ½ tsp vanilla extract
• 1 cup granulated sugar
• Zest from 1 lemon
• 1 stick unsalted butter, room temperature
• 2 egg whites, room temperature
• 12 oz blackberries, 12 berries reserved for garnish
• 1 ½ Tbsp lemon juice
• 1 cup plus 1 Tbsp granulated sugar, divided
• 4 large Gelson’s eggs
• Kosher salt
• 1 tsp vanilla extract
• 1 lb unsalted butter, softened, cut into 2” pieces