Lemon Curd Cake

Name: Lemon Curd Cake
Prep time: 40 min
Cook time: 45 min
Total time: 1 h 25 min
Cuisine: American
Ingredients: 1 cup granulated sugar; 1 egg; (room temperature); 3 egg yolks; (room temperature); ½ cup lemon juice; (about 3 lemons); 1 tablespoon lemon zest; (about 1 lemon); ½ cup unsalted butter; (room temperature and sliced); ⅛ teaspoon salt; 1 ½ cups all-purpose flour; 1 ½ teaspoon baking powder; ¼ teaspoon baking soda; ½ teaspoon salt; ½ cup unsalted butter; (room temperature); 1 ½ tablespoon lemon zest; 2 eggs; (room temperature); 2 tablespoons vegetable oil; 1 teaspoon vanilla extract; ¼ cup sour cream; (full fat, room temperature); ¼ cup buttermilk; (room temperature); 4 ounces cream cheese; (full fat at room temperature); ¾ cup powdered sugar; ½ teaspoon vanilla extract; 1 cup heavy whipping cream; (cold)