Preheat oven to 350F. In a bowl, combine the almond meal, 1/2 cup of oats, 1 Tbsp brown sugar, 1/2 tsp salt, and the egg. Mix until doughy, then press into the bottom of an oiled 9×9″ baking pan. Chop the apples into small pieces, and combine with the cranberries, walnuts, remaining salt, cornstarch, and 3 Tbsp brown sugar in a mixing bowl; stir until all are coated evenly. Add to crust. In a small mixing bowl, combine the remaining brown sugar, oats, and walnut oil and sprinkle on top. Bake for 45 minutes, cut when cooled.