The BEST SOFT and CHEWY Snickerdoodle Cookies

• 1/2 cup (113 g) unsalted butter, room temperature
• 1/2 cup (100 g) granulated sugar
• 3 tbsp (35 g) brown sugar
• 1 large egg, room temperature
• 1 tsp (5 ml) Vanilla Extract
• 1 ½ cup (210 g) All-Purpose Flour
• 1 tsp (4 g) Cream of tartar
• 1/2 tsp (3 g) Baking soda
• 1 tsp (3 g) ground cinnamon
• 1/4 tsp (2 g) Salt

Cinnamon Sugar

• 2 tbsp (30 g) granulated sugar
• 1/2 tsp (2 g) ground cinnamon