Caramel Butter Cake with Fudgy Chocolate Frosting

Bahan-bahan (10 porsi)

• 2 sticks (1 cup) salted butter at room temperature
• 1 1/4 cups granulated sugar
• 1 tablespoon vanilla extract
• 3 large eggs at room temperature
• 2 1/2 cups all purpose flour
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 1 1/2 cups buttermilk, at room temperature
• 1 1/2 cups semi sweet chocolate chips
• 1 cup sour cream
• 1 teaspoon espresso powder ((optional))
• 2 sticks salted butter, at room temperature
• 1 cup packed dark brown sugar
• 1/2 cup heavy cream
• 2 -3 cups powdered sugar
• 1 tablespoon vanilla extract
• flaky sea salt, for sprinkling