Add all of the Ice Cream Base ingredients to a blender and blend until smooth.
Pour the mixture into your Ninja Creami pint and freeze for 24 hours on a level surface.
Take the pint out of the freezer and run it under hot water for 1-2 minutes (all sides, including the bottom).
Spin on Lite Ice Cream mode.
Respin 1-2 times until smooth and creamy.
Once smooth, create a well in the center of the pint (if one didn’t already form while spinning). Add your guava paste into the center. Spin on Mix-In mode.
Place your ice cream in the freezer while you prepare the crust. Crush two graham cracker sheets into a bowl and add the sugar-free maple syrup and a pinch of salt. Mash everything together until it forms a slightly sticky, crumbly mixture. If it’s too dry, add a tiny bit more syrup.
Press or crumble the crust on to the top of your ice cream and enjoy!