Ingredients:
- 2 cups (250g) all-purpose flour
- 1 1/2 cups (300g) dark brown sugar, packed
- 1 tbsp (12g) baking powder
- 1/2 tsp (3g) baking soda
- 1 tsp (6g) fine sea salt
- 1 cup (225g) unsalted butter
- 3 large (150g) eggs
- 1 cup (240ml) full-fat buttermilk
- 2 tsp (10ml) vanilla extract
- 1 cup (200g) granulated sugar
- 6 tbsp (85g) unsalted butter
- 1/2 cup (120ml) heavy cream
- 1 tsp (6g) sea salt
- 1 tsp (5ml) vanilla extract
- 2 cups (450g) unsalted butter, softened
- 4 cups (500g) powdered sugar
- 1/2 cup (120ml) salted caramel sauce
- 2 tbsp (30ml) heavy cream
- 1g salt
Instructions:
- Brown the butter by melting it over medium heat, whisking constantly until foams and brown bits form at the bottom. Remove from heat and cool slightly.
- In a stand mixer, beat the browned butter and dark brown sugar until light and fluffy, approximately 3-4 minutes.
- Add eggs one at a time, beating well after each addition, then stir in the vanilla extract.
- Alternately add the sifted flour, baking powder, baking soda, and salt, and the buttermilk, starting and ending with the flour. Mix until just combined.
- Divide batter into two parchment-lined 8-inch pans and bake at 350°F (175°C) for 50 minutes.
- Prepare salted caramel by melting granulated sugar in a heavy-bottomed pan without stirring until amber. Stir in cubed butter, then slowly whisk in warmed heavy cream, sea salt, and vanilla extract.
- Prepare caramel buttercream by beating softened butter, then gradually adding powdered sugar, reserved salted caramel sauce, heavy cream, and a pinch of salt.
- Cool cake layers completely on wire racks, frost with buttercream, and drizzle with remaining salted caramel sauce.