Whisk sugar, brown sugar, and butter until light and creamy with a hand mixer.

Add the eggs one at a time - whisk well between each egg.

Mix flour, baking powder, salt, and vanilla sugar together in a bowl. 

Sift the flour mixture into the butter-egg mixture. Stir the dough together with a spoon or whisk at the lowest speed. Stop when the dough is combined, and the ingredients are mixed. Do not mix for too long, as your cookies will have the wrong texture.

Chop the chocolate into large chunks the size of hazelnuts. Add it to the dough.

Using 2 tablespoons, place the dough in dollops on baking sheets lined with parchment paper. Remember to leave space between each cookie as they will spread. 

Bake your cookies in the oven at 200 degrees Celsius (392 degrees Fahrenheit) for 12-15 minutes. 

Let the cookies cool on a wire rack.