01 - Preheat oven to 350°F. Grease and flour three 8-inch cake pans; line bottoms with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl until uniformly blended.
03 - Beat butter and sugar in a large mixing bowl until light and fluffy, approximately 3-4 minutes. Incorporate eggs one at a time, then blend in vanilla extract.
04 - Add flour mixture and milk alternately to the creamed mixture in three additions, beginning and ending with flour. Mix only until just incorporated.
05 - Distribute batter evenly among prepared pans. Bake for 28-32 minutes until a toothpick inserted in the center emerges clean. Cool in pans for 10 minutes, then transfer to wire racks to cool completely.
06 - Combine sugar and water in a heavy saucepan over medium heat, swirling gently until sugar dissolves. Increase heat to medium-high and cook until reaching golden amber color, 7-10 minutes. Remove from heat; carefully whisk in butter, followed by cream and salt. Cool to room temperature.
07 - Beat butter until creamy. Gradually incorporate powdered sugar, then add caramel sauce, vanilla, and salt. Whip until light and fluffy, approximately 2-3 minutes.
08 - Position one cake layer on a serving platter. Spread with an even layer of caramel frosting. Repeat with remaining layers. Frost top and sides completely. Drizzle additional caramel sauce over the top for a glossy finish.
09 - Refrigerate assembled cake for at least 30 minutes before serving to ensure clean slices.