Ingredients
Method
- Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone mat.
Mix dry ingredients:
- In a small bowl, whisk together the flour and salt. Set aside.

Cream butter and sugar:
- In a larger mixing bowl, beat the room temperature butter and sugar together until light and fluffy.

Add egg yolk and vanilla:
- Beat in the egg yolk and vanilla extract until fully combined.

Combine dry and wet:
- Gradually add the flour mixture to the butter mixture. Mix until a soft dough forms.

Shape the cookies:
- Roll dough into 1-inch balls. If using nuts, roll each ball in the chopped walnuts, pressing gently to adhere.
Make the thumbprint:
- Place the dough balls on the prepared baking sheet spaced about 2 inches apart. Using your thumb or the back of a small spoon, press gently into the center of each ball to create a small well.
Optional gloss:
- If desired, lightly brush the tops of the cookies with the reserved egg white for a glossy finish.
Bake:
- Bake for 12–15 minutes, or until the edges just begin to turn golden.
Add filling:
- Remove the cookies from the oven and immediately spoon about ½ teaspoon of your favorite jam or preserves into each thumbprint.
Cool:
- Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

- Enjoy!
