Creating your own batch of Thumbprint Cookies is straightforward. Follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Cream Butter and Sugar: In a bowl, cream together the softened butter and granulated sugar until light and fluffy.
3. Add Flavorings: Mix in the vanilla extract, almond extract (if using), and egg yolk until well combined.
4. Combine Dry Ingredients: Gradually add the flour and salt. Mix until the dough comes together.
5. Shape the Cookies: Take small portions of dough (about 1 inch in diameter) and roll them into smooth balls. Place them on the prepared baking sheet.
6. Create the Thumbprint: Use your thumb or the back of a measuring teaspoon to create an indentation in the center of each cookie.
7. Fill with Jam: Spoon a small amount of your chosen jam into each thumbprint, ensuring not to overfill.
8. Bake: Place the baking sheet in the oven and bake for 12-15 minutes, or until the edges are lightly golden.
9. Cool: Remove from the oven and let the cookies cool on the baking sheet for 10 minutes before transferring them to a wire rack.

These steps ensure your Thumbprint Cookies are simple to make, yet profoundly satisfying!