Preheat oven to 350.
Line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking soda, cream of tartar, and sea salt.
In another bowl, mix together melted butter/oil, applesauce, and vanilla extract, until nice and smooth.
Pour wet ingredients into dry ingredients and incorporate well.
Fold in sprinkles.
Refrigerate the dough for 20 minutes.
Remove from refrigerator and use a cookie scoop to form 12 cookies.
Bake 8-10 minutes
Let cool and devourrrrrrrr!!!!!!!!!