based on: Smitten Kitchen by Deb Perelman

• 8 tablespoons (1 stick) unsalted butter (room temperature)

• 150 g sugar, plus 25 g for rolling

• 1 large egg

• 1 tablespoon cinnamon

• 180 g flour

• 1 teaspoon cream of tartar

• ½ teaspoon baking soda

• ⅛ teaspoon salt

1. Warm the butter to room temperature.

2. Cream the butter and 150 g of sugar together till light and fluffy, 2-4 minutes.

3. Add the eggs and beat to combine.

4. Mix the flour, baking soda, cream of tartar, and salt and add to the butter mixture on low.

5. Refrigerate 1-3 hours till firm.

6. Roll into balls, roll with cinnamon/sugar mixture (1 tb cinnamon + 25 g sugar).

7. Bake at 400 °F for 9 - 11 minutes till golden on the edges and cracked in the middle.