Ingredient:

• 1-1/2 pounds fresh strawberries, hulled
• 1/2 cup unsalted butter, softened
• 1 cup sugar
• 1 large egg, room temperature
• 1 large egg white, room temperature
• 1 teaspoon vanilla extract
• 1-1/3 cups all-purpose flour
• 1/2 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/3 cup 2% milk
• 1/4 cup sour cream
• Red food coloring, optional
• 1/2 cup unsalted butter, softened
• 5-1/2 to 6 cups confectioners' sugar, divided
• 2 tablespoons 2% milk
• 1 teaspoon vanilla extract
• 1/8 teaspoon salt