Preheat the oven to 350 and line a baking sheet with parchment paper or a silicone mat.

In a large bowl, combine the butter and 1 cup of sugar and mix untli creamy.

Add in vanilla and eggs 1 at a time, until fully incorporated.

Mix in the baking soda, cream of tartar and salt.

Stir in flour 1 cup at a time, mixing throughly.

Use a teaspoon or small cookie dough scoop to drop rounded dough balls onto the prepared baking sheet.

Grease a flat bottomed glass with the reserved melted butter and dip in reserved 1/4 cup of sugar. Lightly flatten the dough balls into cookie shape, leaving behind a dusting of sugar.

Bake for 15 minutes or until cookies are golden and slightly browned on the bottom. Rotate the cookie sheet half way through baking

Let them cool for about an hour on a cooling rack before eating.