Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

In a large mixing bowl, cream together 1 cup of softened unsalted butter and 1 cup of granulated sugar using an electric mixer until light and fluffy.

Gradually add 2 cups of all-purpose flour to the butter mixture, mixing on low speed until a soft dough forms.

Using a tablespoon, scoop out portions of the cookie dough and roll them into balls with your hands.

Spoon about half a teaspoon of your chosen jam into each thumbprint indentation.

Slide the baking sheets into your preheated oven and bake for 10-12 minutes, or until lightly golden.

Transfer the cookies to a wire rack to cool completely.