Preheat your oven to 350°F. Line two baking sheets with parchment paper.

In a large bowl, cream together the softened butter and granulated sugar until light and fluffy.

Beat in the egg and vanilla extract until well combined.

In a separate bowl, whisk together the flour, salt, and baking powder. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Scoop tablespoon-sized portions of dough and roll them into balls. Place them on the prepared baking sheets, spacing them about 2 inches apart.

Using your thumb or the back of a teaspoon, make an indentation in the center of each cookie.

Fill the indentations with red and blue jam, alternating colors for a festive look.

Sprinkle the tops with red, white, and blue sprinkles.

Bake for 12-15 minutes, or until the edges are lightly golden. Let the cookies cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.