Preheat the oven to 160ºc and line a baking tray with parchment paper.
In a medium saucepan melt the butter and continue to cook until the butter is foaming and starting to brown. Remove it from the heat and pour the butter into a ceramic bowl to let it cool.
Once cooled add in the vanilla extract and both sugars. Whisk in the eggs one at a time mixing well after each addition. Sift the flour, baking powder and bicarb into the butter and sugar mixture. Stir until just combined being careful not to over mix.
Mix in the white chocolate chips (or chunks) and using a cookie scoop, drop tablespoon-sized scoops of cookie dough onto the baking tray. Sprinkle with sea salt and bake in the preheated oven for 10-12 minutes.
Leave to cool on the tray for about 5 minutes before carefully moving to a wire rack to cool completely.
Notes
The cookies are baked when the edges are set and the middle is still soft to the touch and the surface is starting to turn golden.
You can use dark brown sugar in place of light, but your cookies will be a little bit darker and a touch softer.
The sea salt sprinkle is optional but helps to balance the sweetness of the white chocolate.