Preheat your oven to 350 degrees F and line a baking sheet with parchment paper.
With a whisk, electric mixer, or stand mixer with paddle attachment, mix the butter and sugars until well combined for about 1 minute. Then beat in the eggs and vanilla until combined.
In a separate large bowl, whisk together the flour, baking powder, and salt. Slowly add the dry ingredients to the wet ingredients and beat on low-speed just until combined. Add white chocolate chips and sprinkles. Mix on low speed until just incorporated into the dough.
Measure 3 heaping tablespoons of the dough or use a large cookie scoop. Place dough balls on cookie sheet, give them a little space in between.
bake the cookies 15-17 minutes or until the edges of the cookies begin to turn golden brown. They will look a bit underdone in the middle, but they continue to cook once out of the oven. Don't over bake!
Cool the cookies on the sheets for 5 minutes to allow them to set up. Remove the cooled cookies from the baking sheets and transfer to a wire rack to cool completely. Makes 15 large cookies.