Eggnog Layer Cake with Salted Caramel

Name: Eggnog Layer Cake with Salted Caramel
Prep time: 2 h
Cook time: 25 min
Total time: 2 h 25 min
Cuisine: American
Ingredients: 2 1/2 cups cake flour (substitute all purpose flour); 2 teaspoons baking powder; 3/4 teaspoon ground nutmeg; 1/2 teaspoon kosher salt; 1 cup unsalted brown butter (room temperature); 1 cup granulated sugar; 1/2 cup light brown sugar; 3 large eggs (room temperature ); 2 tablespoons bourbon (optional); 2 teaspoons vanilla extract; 1 cup eggnog; 2 tablespoons eggnog; 2 teaspoons bourbon (optional); 1 1/2 cups unsalted brown butter (room temperature); 4 cups powdered sugar; 1-2 tablespoons eggnog (more as needed ); 2 teaspoons bourbon (optional ); 1/2 cup salted caramel