Preheat the oven to 180 degrees.
Peel, core and cut the apples into small cubes.
Mix the apple pieces with 3 drops of stevia and 1 teaspoon of cinnamon.
In another bowl, mix the oats, cinnamon, salt, and protein powder.
Add the agave syrup, apple sauce, remaining stevia and cinnamon, and margarine. Knead it with your hands into a crumbly dough.
Divide the apple cubes in an oven dish. Crumble the dough over it.
Bake for 20 minutes.
Add some yogurt if necessary.