Place pretzels into a blender or a food processor.
Add granulated sugar, and melted butter.
Blend for 30-40 seconds.
(You don’t want the pieces of pretzels to be too fine – be sure to not blend too much)
Pour the pretzel mixture into the pre-prepared dish and press it evenly to form a crust. Bake for 10 minutes.
Before adding the cream cheese layer, take it out of the oven and let it cool completely (at least 15 minutes).
Mix it with sugar substitute and cream cheese in a food processor. Combine till nice and smooth.