Preheat your oven to 350°F (175°C).

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

Add the egg and vanilla extract to the creamed mixture and mix until well combined.

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add to the wet mixture.

Fold in the colorful sprinkles evenly throughout the dough.

Drop spoonfuls of dough onto a parchment-lined baking sheet, leaving space for spreading.

Bake in the preheated oven for 10-12 minutes until edges are lightly golden.

Allow cookies to cool briefly on the baking sheet before transferring to a wire rack.