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1. Place butter at room temperature until softened. Cream the butter and sugar with an electric mixer over medium speed until the mixture is smooth, fluffy and light in color.

2. Add in whisked egg, half at a time, beat over low speed. Add vanilla extract, mix well.

3. Sift in flour in two batches, scraping down the sides of the bowl between additions with a spatula, and make sure all ingredients combine well. Knead into dough. (see picture)

4. Roll out the dough to a 1/2 cm thickness. Cut dough with a cookie cutter that is just a bit smaller than your tart tin in size. Line dough in the middle of tart tins, one by one. Lightly press the dough with your thumbs, starting from the bottom then up to the sides. While pressing the dough, turn the tart tin clockwise/anti-clockwise in order to make an even tart shell. Trim away any excess dough.