1 cup unsalted butter, softened to room temperature
2/3 cup granulated sugar
1 large egg yolk
1 teaspoon vanilla extract
2 cups all-purpose flour
1/4 teaspoon salt
1/2 cup high-quality lemon curd
Powdered sugar, for dusting
Instructions
Preheat your oven to 350°F (175°C). Line two large baking sheets with parchment paper or silicone baking mats to prevent the cookies from sticking and ensure even browning.
In a large mixing bowl, beat the softened butter and granulated sugar together using an electric hand mixer or a stand mixer. Continue beating for about 2-3 minutes until the mixture is light, fluffy, and pale in color.
Add the egg yolk and vanilla extract to the butter mixture. Beat again on medium speed until fully combined, scraping down the sides of the bowl with a spatula as needed to ensure everything is incorporated.
Gradually stir in the all-purpose flour and salt. Mix on low speed just until the flour disappears and a soft dough forms. Be careful not to overmix, as this can make the cookies tough rather than tender.
Scoop about 1 tablespoon of dough at a time and roll it into a smooth 1-inch ball. Place the balls on the prepared baking sheets, spaced 2 inches apart. Use your thumb or the back of a small measuring spoon to gently press an indentation into the center of each ball.
Place the baking sheets in the oven and bake for 10 to 12 minutes, or until the edges are just barely starting to turn a light golden brown. The cookies should still look pale. If the indentations have puffed up, gently press them back down while the cookies are still warm.
Allow the cookies to cool on the baking sheet for 5 minutes. While still slightly warm, spoon about 1/2 teaspoon of lemon curd into each indentation. Transfer the cookies to a wire rack to cool completely. Once cool, dust with powdered sugar if desired.