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MIX 200 gram butter together with the contents of the packet vanilla sugar (8 gram) along with 200 gram sugar in the bowl of the stand mixer. SIMPLY use a large bowl + whisk if you don't own a stand mixer.
CRACK open an egg, add into the mixture. ADD a pinch of salt and mix well. ADD 250 gram regular flour and mix well. WHISK the other egg into the small bowl using a fork.
GREASE the spring form (24 cm) with some butter. DIVIDE the boterkoek dough over the bottom of the spring form. FLATTEN the boterkoek (Dutch butter cake) dough using cling film.
Use your hands to press the dough into the spring form.
GENTLY brush the top of the boterkoek with the whisked egg. USE a silicone brush for this. CREATE a nice pattern on top of the boterkoek using a fork.
PRE-HEAT the oven to a temperature of 180 degrees celsius. BAKE the boterkoek in 25 - 30 minutes golden-brown. CHECK every now and then while baking.
REMOVE the boterkoek from the oven when it's done and let cool off completely on a cooling rack. THEN place the boterkoek into the refrigerator until hardened.
SERVE the boterkoek by dividing it into 8 equal pieces first. Enjoy your home-made boterkoek!