Preheat oven to 375 degrees. In a stand mixer with paddle attachment, place butter and granulated cream, cream until smooth. Add in the eggs one at a time, mixing between each. Add in the vanilla and mix. In a large bowl, whisk together the remaining ingredients. Slowly add the dry to the wet ingredients and mix until combined, scrapping down the bowl if necessary.
Grease a 11x17 inch sheet tray. Scrape out cookie dough onto tray. Spray hands with baking spray, press dough into pan evenly. Bake 12-15 minutes until light golden brown and a toothpick inserted into the middle comes out clean. Let cool completely.
Frosting
Place cream cheese in a stand mixer, add half of the powdered sugar a little at a time until mixed. Scrap down sides as needed.
Add in the zest, juice, vanilla and salt. Mix to combine. Add in the remaining sugar a little at a time until fully mixed.
Frost sugar cookie, add sprinkles if desired. Cut into bars, serve and enjoy.