Easy Shortbread Thumbprint Cookies Recipe

These classic thumbprint cookies are made with a simple sugar cookie dough, rolled in sparkling sugar, and then indented and filled with your choice of jam! These are an all-time favorite cookie recipe, and the filling options are absolutely endless!

1 cup unsalted butter softened to room temperature (226g)
1/3 cup sugar (70g)
1/3 cup light brown sugar, tightly packed (70g)
1 large egg yolk
3/4 teaspoon vanilla extract
2 1/4 cup all purpose flour (280g)
2 teaspooons cornstarch
1/2 teaspoon salt
1/2 cup sugar for rolling (optional)
1/3 cup jam or preserves flavor of your choice — I used raspberry preserves for this recipe (105g)

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