Remove the fruit from the freezer and allow it to thaw slightly while you work on the cobbler dough.
Make the batter by mixing 1 ¼ cup of flour, 3 tablespoons of low-calorie sweetener, and the entire baking powder and cinnamon.
Once you mix the dry ingredients, add the applesauce, egg, butter replacement, and milk. Stir until a thick batter forms. Do not over-mix.
Next, toss the fruit with the remaining ¼ cup of flour and 1 cup of sweetener. Set aside.
Spread the cobbler batter into the bottom of a greased 7-quart slow cooker. If you have a slow cooker of a different size, check my notes below.
Pour the fruit mixture on top of the batter and evenly spread it.
Cover the 7-qt slow cooker and allow it to cook on HIGH for roughly 2 hrs to 2 hrs 15 minutes. Every slow cooker varies, so I suggest checking on it at the 1-hr 45-minute mark.
The cobbler is done once the fruit is bubbling and the batter is thoroughly baked. Insert a toothpick or utensil into the center to check the cobbler batter's texture, ensuring it is no longer wet or gooey.