Preheat & Prep:
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.

Make the Dough:
In a large mixing bowl, beat the butter and granulated sugar until light and fluffy. Add egg yolks and vanilla extract, and mix until combined. Gradually add flour and salt, mixing until a dough forms.

Shape the Cookies:
Roll the dough into 1-inch balls and place them on the prepared baking sheet about 2 inches apart. Use your thumb or the back of a spoon to gently press an indentation in the center of each cookie.

Bake:
Bake for 12-14 minutes or until the edges are lightly golden. Remove from oven and gently press the centers again if they puffed up. Let cookies cool completely on a wire rack.

Fill & Decorate:
Once cooled, fill the indentations with pastel-colored frosting or melted white chocolate. Decorate with festive sprinkles or mini candy eggs.

Serve & Enjoy:
Let the frosting or chocolate set before serving. Enjoy these fun and festive Easter cookies!