2. Cream the butter and sugar:
Beat together the butter and sugar with an electric mixer on medium-high speed, about 2 minutes, or until light and fluffy.
3. Add the egg and vanilla:
Add the egg and mix on medium until well combined.
4. Mix in the flour:
Add the flour and salt and mix on low speed until just combined. The dough will be thick like cookie dough.
5. Add to the prepared pan:
Transfer the dough to the prepared pan. Cover the dough with a piece of parchment paper or plastic wrap so that it doesn’t stick to your hand while you use your palm to press the dough, spreading it evenly to the edges of the pan.
6. Brush with egg wash:
Beat the egg with the teaspoon of water in a small bowl to make an egg wash. Brush the top of the cake lightly with the egg wash. Make a crosshatch pattern over the surface of the dough using the tines of a fork.
7. Bake:
Bake the boterkoek in the preheated oven until lightly golden brown and a wooden pick inserted in the center comes out clean, about 30 minutes.
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