Preheat your oven to 350°F (175°C).
In a large bowl, cream together the softened butter and sugar until fluffy.
Beat in the egg and vanilla extract 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 until just combined.
Fold in the colorful sprinkles gently.
Scoop tablespoon-sized amounts of dough onto a baking sheet lined with parchment paper.
Flatten each scoop slightly with your hand.
Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.
Allow cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.