Preheat Oven
Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
Mix Dry Ingredients
Whisk flour, baking powder, baking soda, and salt in a bowl.
Cream Butter & Sugars
Beat butter, granulated sugar, and brown sugar until light and fluffy.
Add Egg & Vanilla
Mix in egg and vanilla extract until smooth.
Combine
Gradually add dry ingredients to wet ingredients, mixing just until combined.
Fold in Sprinkles
Gently fold in sprinkles without overmixing.
Bake
Scoop dough onto baking sheets and bake for 9–11 minutes, until edges are set and centers are soft.
Cool
Let cookies cool on the pan for 5 minutes, then transfer to a wire rack.