Salted Caramel Chai Cake (6 Inch Small Batch Cake)

Name: Salted Caramel Chai Cake (6 Inch Small Batch Cake)
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: European
Ingredients: 1 cup + 3 tablespoon all purpose flour (150g); 3/4 teaspoon baking powder; 1/4 teaspoon salt; 1 teaspoon ground cinnamon; 1/2 teaspoon ground cardamom; 1/4 teaspoon ground ginger; 1/8 teaspoon ground nutmeg; 1/2 cup + 2 tablespoon softened butter (150g); 3/4 cup sugar (150g); 2 large eggs; 3 tablespoon buttermilk; 1/2 teaspoon vanilla extract; 1/4 cup salted caramel* (4 tbsp) + more for garnish; 3 cups sifted powdered sugar (375g); 5-6 tablespoon strong coffee; 3 tablespoon softened butter; 1 1/2 tablespoon unsweetened cocoa powder