In a large mixing bowl, cream the shortening, sugar and eggs until creamy. Sift the flour, cream of tartar, soda and salt into the sugar mixture and whisk to combine. Use a wooden spoon to mix in the white chocolate chips.
In a small bowl, whisk the sugar with the cinnamon. Use a #24 scoop or 2 tablespoon scoops to portion the dough and roll into balls. Dip each ball into the cinnamon sugar mixture and place 6 dough balls on a lightly greased or parchment prepared cookie sheet.
Bake for 9-12 minutes or until cookies rise and crack on top. The cookies won't brown so be careful not to over bake. Allow the cookies to cool on the sheet for 10 minutes then transfer to a cooling rack. Store the cookies in an airtight container for up to 3 days.