• Preheat oven to 350ºF (180°C). Grease a 9x13-inch baking pan with cooking spray.

How to make Snickerdoodles:

• In a medium bowl, combine flour, cream of tartar, baking soda, salt, and cinnamon.
• In the bowl of a stand mixer, beat butter and sugar until pale and fluffy, about 3 minutes.
• Add eggs and vanilla extract. Mix until just combined.
• Gradually add flour mixture and mix on low until just combined.
• Press about two-thirds of the snickerdoodle dough into an even layer in the bottom of the pan.

How to make cheesecake mixture:

• Beat cream cheese and sugar until fluffy, about 1 minute.
• Add eggs, vanilla, and salt and beat until combined.
• Pour cheesecake mixture on top of snickerdoodles and smooth the top with a rubber spatula.
• Break up remaining snickerdoodle dough into small pieces and sprinkle over cheesecake layer.
• In a small bowl combine sugar and cinnamon. Sprinkle on top of snickerdoodle dough.
• Bake until edges are set and center of cheesecake mixture is only slightly jiggly, about 40-45 minutes.
• Let cool completely. Slice into squares. Cover and store in the refrigerator.