- In a stand mixer, cream butter and vanilla. Add sugar and kosher salt, then slowly add flour. Scrape down the bowl halfway through.
- Wrap dough in plastic wrap to make a long log. About the size of a Loonie, chill for an hour. Cut into coins about 5/8th of an inch.
- Bake at 350 on parchment paper until the first sight of tanning.
- Remove let cool, add a teaspoon of dulce de leche to the bottom, and make a perfect sandwich.
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