Follow these easy steps to create delicious Cheesy Thumbprint Cookies:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Baking Sheet: Line a baking sheet with parchment paper.
3. Cream Butter and Cheese: In a large mixing bowl, combine the softened butter and shredded cheese. Cream them together until smooth and creamy.
4. Add Sugar: Gradually add granulated sugar and mix until well combined.
5. Mix in Egg Yolk: Add the egg yolk and vanilla extract, mixing well to incorporate.
6. Add Flour and Salt: Gradually add the flour and salt to the wet mixture, stirring until a dough forms.
7. Chill Dough: Refrigerate the dough for about 15-20 minutes for easier handling.
8. Shape Cookies: Roll the dough into small balls (about 1 inch in diameter) and place them on the prepared baking sheet, spaced apart.
9. Make Thumbprints: Use your thumb or the back of a spoon to create a small indentation in the center of each dough ball.
10. Fill with Preserves: Spoon a small amount of fruit preserves into each indentation.
11. Bake: Place the baking sheet in the preheated oven and bake for 10-12 minutes or until the edges are lightly golden.
12. Cool Cookies: Remove the cookies from the oven and let them cool on the baking sheet for about 5 minutes, then transfer them to a wire rack to cool completely.

These step-by-step instructions make it simple for anyone to create these delightful Cheesy Thumbprint Cookies.