Caramel Mousse Cake

Name: Caramel Mousse Cake
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: European, Mediterranean, French
Ingredients: 1 cup granulated sugar; 5 tablespoons unsalted butter (room temperature ); 1/2 cup heavy cream (room temperature ); 1 teapsoon sea salt; 1 teaspoon vanilla extract; 1 cup all purpose flour; 1/4 cup plus 2 tablespoons unsweetened cocoa powder; 1 teaspoon baking soda; 1/2 teaspoon salt; 1 large egg; 1/2 cup buttermilk; 1/2 cup vegetable oil; 1/2 cup hot coffee; 1 cup cream cheese (room temperature, soft to the touch); 1/2 cup salted caramel sauce (cooled down); 1 cup heavy cream (cold); 1/3 cup salted caramel sauce