Preheat the oven to 350 F. Line a 12 cup muffin pan with paper liners. In a medium bowl, whisk together flour, salt, and baking soda. In a large bowl, combine butter with sugar until fluffy.
Add in the egg and vanilla extract, and mix until smooth. Fold in the sprinkles and white chocolate chips. Evenly divide the cookie dough between the prepared muffin pan. Bake for 12-15 minutes.