- Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper. 
- In a medium bowl, whisk together the flour, baking soda, and salt. Set aside. 
- In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy, about 2-3 minutes. 
- Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract. 
- Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix. 
- Fold in the rainbow sprinkles and white chocolate chips until evenly distributed. 
- Use a cookie scoop or tablespoon to drop dough onto the prepared baking sheets, spacing them about 2 inches apart. 
- Bake for 10-12 minutes, or until the edges are lightly golden. The centers may look slightly underbaked; they will firm up as they cool. 
- Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.