Blend the base: Add the Carbmaster milk, Monk Fruit In The Raw, vanilla, xanthan gum, and salt to the Ninja Creami pint. Use an immersion blender to blend for about 30–60 seconds, until the ingredients are fully combined and no clumps remain. A regular blender, handheld milk frother, or shaker cup can also work.
Prepare the Pop-Tart: Break half of the Frosted Strawberry Pop-Tart into small pieces for the Mix-In cycle. Reserve the remaining half for topping. Measure out 34 g (2 tbsp) of strawberry spread, setting aside 17 g (1 tbsp) for the Mix-In cycle and 17 g (1 tbsp) for topping.
Freeze: Make sure the liquid mixture is below the MAX FILL line. Place the pint on a level surface and freeze for at least 24 hours. Freeze with the lid removed to help prevent a bump from forming.
Prepare to spin: Remove the pint from the freezer and make sure the frozen surface is level, with no raised bump. Do not process a pint with a significantly uneven frozen surface. If necessary, allow the mixture to soften or melt, smooth it out, and refreeze it on a level surface until completely solid. Run hot water over the outside of the pint for about 1 minute or let it sit on the counter for about 15 minutes.
Spin: Process using the Lite Ice Cream setting. Check the texture. If it still needs significant processing, run a Re-Spin. If it’s already close to the texture you like, you can go directly to the Mix-In cycle.
Add the Pop-Tart and strawberry spread: Make a hole slightly off-center with a butter knife. Add the pieces from half of the Frosted Strawberry Pop-Tart and 17 g (1 tbsp) of strawberry spread, then run the Mix-In cycle. Crumble the remaining half of the Pop-Tart over the finished ice cream, drizzle the remaining 17 g (1 tbsp) of strawberry spread on top, and enjoy.