Preheat your oven to 350F (177C) and line a 9x13 inch baking tray.

In a large mixing bowl, whisk together the melted butter, brown sugar, and granulated sugar until well combined.

Whisk in the eggs and vanilla extract until fully combined.

Add the flour, baking powder, and salt and mix until just combined, then fold in the chocolate chips.

Scoop the batter into the prepared 9x13 pan and spread it around into one even layer.

Bake at 350F (177C) for 28-32 minutes or until the top is set and lightly browned. Remove from the oven and transfer the pan to a wire rack to cool completely before slicing into bars.