There are a few recipes around for filled zucchini with ground beef but I thought the vegan ground beef (not sure exactly what it is called but a vegetarian substitute for ground meat, perhaps soy crumble?) I usually have in the freezer would do the trick. And it sure delivered! Even though this might not be a weeknight dinner it sure was delicious and we will be doing it again for sure!
Västerbottenost worked amazingly well in this recipe, but feel free to experiment with other strong flavored cheese.
If you are using small to medium sized zucchinis then the filling will be heaping over like in the picture. When using quite large ones so they cover a complete oven sheet pan then the filling will be around level with the zucchini.