Preheat oven to 350 ºF
Combine the flour, butter and 1/4 cup sugar in a bowl. This will be the crust layer.
Press this mixture into a greased 8x8 baking dish and bake for 10-12 minutes, or until browned.
While the crust is baking, mix together the cream cheese. vanilla and liquid sweetener in a bowl. This will be the filling.
Wait for the crust to cool and then pour the filling over the crust. Spread until it forms an even layer.
Mix the apples, 1/3 cup sugar, apple pice spice, rolled oats and oil in a bowl. This will be the crumble layer.
Pour the crumble over the filling and bake for 45 minutes.