In a small saucepan, combine puréed mangoes and 1 tablespoon of sugar.
Simmer over medium heat for 15 minutes until slightly reduced, lowering the heat when it starts to bubble. Stir frequently to avoid burning on the bottom. Let it cool.
Preheat the oven to 325° F (165° C) and position a rack in the middle.
Pulse graham crackers into fine crumbs in a food processor or crush them in a zip-top bag. Mix with butter, brown sugar, and salt.
Spread the graham cracker mixture evenly into the pan and firmly press it down using a ramekin or the bottom of a glass. Bake for 10 minutes, then let it cool.
Combine cream cheese, ½ cup mango purée (save the rest for the swirls), sugar, flour, salt, and vanilla in a large bowl. Beat on medium-low speed until smooth. Scrape the bottom and sides as needed.
Add the eggs and mix them until just combined.
Finish mixing with a spatula to ensure it is evenly combined.
Pour the mixture over the crust and spread it evenly.
Drop spoonfuls of the mango purée on top. Alternatively, you can use your favorite store-bought or homemade mango jam instead.
Bake for approximately 30-32 minutes until the center is set and no longer wet.
Allow it to cool completely in the pan uncovered to prevent condensation, which can make the crust soggy and cause the layers to separate.
Refrigerate at least 4 hours before cutting and serving.