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Preheat oven to 300 degrees F. Grease an 8×8″ baking pan with butter.
Using a stand mixer or electric beaters, beat butter until fluffy, about 2 minutes. Scrape down sides.
Add powdered sugar and vanilla extract and beat again.
Add flour and salt and beat to combine, scraping down sides as needed. (Do not overmix.) Refrigerate dough for 10 minutes.
Dump chilled dough into greased pan and use your hands to press into an even layer. Dust your hands with a little flour if it gets sticky.
Bake for 45 minutes. Remove pan from oven and, using a sharp knife, cut the partially-baked dough into 12 rectangles.
Bake for 15 minutes more, or until cookies are golden on the sides. Cool completely before serving.