Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy, about 3-4 minutes.
Add the egg yolk, lemon juice, and lemon zest to the butter mixture, and beat until well combined.
In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add the dry ingredients to the wet mixture, mixing just until incorporated.
Roll the dough into 1-inch balls and place them about 2 inches apart on the prepared baking sheet. Using your thumb or the back of a spoon, make a small indentation in the center of each ball.
Spoon about 1/2 teaspoon of raspberry jam into each indentation.
Bake in the preheated oven for 12-15 minutes, or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely. Once cooled, dust with powdered sugar if desired.