Preheat your oven to 350°F (180°C) and line a 9-inch (22 cm) cake pan with parchment paper.
In a bowl, whisk together the flour and baking powder. In a separate bowl, cream together the eggs and sugar until light and fluffy.
Add the melted butter and milk to the egg mixture and stir until smooth. Gradually add the dry ingredients, mixing until just combined.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until golden brown and a toothpick inserted into the center comes out clean. Let cool in the pan.
For the caramel layer, melt the brown sugar in a saucepan over medium heat. Add a pinch of salt and the heavy cream. Stir until smooth and let cool slightly.
Pour the caramel over the top of the cake and sprinkle with toasted walnuts for a crunchy texture.
Refrigerate the cake for at least 2 hours to allow the caramel to set.
Before serving, slice the cake and garnish with additional caramel, if desired.
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