Preheat oven to 350°F.
Prepare a 13"x18" sheet pan by spraying with non-stick cooking spray (we prefer PAM baking spray).
In the bowl of an electric stand mixer, combine the butter and sugar until light and fluffy. Next, add the eggs and vanilla and continue to mix until well combined.
Slowly add the flour, salt, baking soda and sprinkles to the mixer. Mix until just combined - do not over mix.
Spread the sugar cookie dough into the prepared sheet pan, pressing evenly until pan is filled.
Bake for 12 - 15 minutes until slightly brown. The cookie bars will look like they are still a bit doughy, but will firm up and cook as they set for a few minutes. Cool completely and serve within 2 days for best results.