Preheat oven to 175C / 350F

Line a 9×13 baking pan with parchment paper.

Add the butter to a small saucepan or skillet. Melt the butter until it starts to brown and smell caramelized. Remove from the heat and stir in sugar, brown sugar and vanilla extract.

Let the mixture cool down for 5 minutes or until no longer hot.

In a large bowl whisk the eggs until they start foaming on top.

Stir the butter and sugar mixture into the eggs.

Add the flour and baking powder and mix until just combined.

Transfer to the prepared baking pan and sprinkle the chocolate chips over the batter (leaving a handful left to decorate the top with when they come out of the oven) Bake in the oven for 18-20 minutes.

Remove from the oven and sprinkle the remaining chocolate chips over the blondies. Let the blondies cool down in the pan for 3-5 minutes before serving.