Cake:

• ▢ ½ cup unsalted butter softened
• ▢ 1 cup granulated sugar
• ▢ ½ cup brown sugar
• ▢ 2 large eggs
• ▢ 1 teaspoon vanilla extract
• ▢ ½ teaspoon baking soda
• ▢ ½ teaspoon salt
• ▢ 1 ½ teaspoons baking powder
• ▢ 2 ⅓ cups cake flour
• ▢ 1 cup buttermilk
• ▢ Caramel
• ▢ ½ cup salted butter
• ▢ ½ cup brown sugar
• ▢ 1 tablespoon vanilla extract
• ▢ 2 tablespoons agave
• ▢ salt
• ▢ Frosting
• ▢ 2 cups powdered sugar sifted
• ▢ ¾ cups unsalted butter
• ▢ ½ teaspoon salt