01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
03 - In a large mixing bowl, beat the softened butter with both sugars until light and fluffy, about 2–3 minutes.
04 - Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract.
05 - Gradually add the dry ingredients to the wet mixture, mixing until just combined.
06 - Fold in the sprinkles and white chocolate chips (if using) with a spatula until evenly distributed.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.
08 - Bake for 9–11 minutes, or until the edges are set and the centers look slightly underbaked.
09 - Remove from the oven and let cookies cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.