Preheat oven to 350?F.

Line a baking sheet with parchment paper.

Combine 1/4 c sugar and 1 T. cinnamon for cinnamon-sugar topping. Set aside.

In a large bowl, beat 1 1/2 c. sugar and butter and medium speed until light and fluffy. About 3-5 minutes.

Beat eggs in one at a time, scraping the sides of the bowl after each addition.

Stir in vanilla.

Sift flour, cream of tartar, baking soda and salt into mixing bowl.

With mixer on low, mix until thoroughly combined.

Working 1 T. of sought at a time, roll dough into balls, placing a single Rolo inside each ball of dough.

Roll balls in cinnamon-sugar mixture and place on baking sheet.

Sprinkle balls with sea salt.

Bake for 7-8 minutes. The cookies should look raw between the cracks and seem underdone.

Let cookies cool on baking sheet for 5 minutes then transfer to a wire rack to cool completely.