Light up your kitchen during the holidays with this "jewel" of a cookie! The buttery shortbread is made in a mini muffin pan, and they're filled with the fruit preserve of your choice.
Ingredients
1 cup plus 1 ½ tablespoons salted butter, softened (such as Kirkland grass-fed salted butter)
1 ⅔ cups powdered sugar
4 cups all-purpose flour
1/2 teaspoon kosher salt
2 large eggs, at room temperature
2 large egg yolks, at room temperature
2 teaspoons vanilla extract
1 cup jam or jelly of choice
Directions
Cream butter in a large bowl with an electric mixer or use a stand mixer. Add powdered sugar and beat on low until a crumbly, sandy mixture forms. Gradually add salt and flour, 1 cup at a time, while mixing on low speed. The dough may look extremely dry and crumbly at this point.
Mix in eggs, egg yolks, and vanilla initially using the mixer, then finishing with your hands to create a smooth, soft, and pliable dough, incorporating all the flour at the bottom of the bowl. Gather dough into a ball and refrigerate in a covered container for about 2 hours.