Kue Mangkuk Vanila

Bahan-bahan (12 porsi)

• 1 ½ cups all-purpose flour
• ¾ cup granulated sugar
• ¼ teaspoon kosher salt
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• ¾ cup sour cream (room temperature)
• ½ cup vegetable oil
• 1 large egg (room temperature)
• 1 tablespoon pure vanilla extract
• 12 ounces unsalted butter (3 sticks, room temperature)
• 1 ½ cups powdered sugar
• 6 tablespoons heavy whipping cream
• 1 ½ teaspoons pure vanilla extract
• a big pinch of salt