Stuffed Grilled Zucchini

4 medium zucchini
5 tsp olive oil, divided
2 Tbsp finely chopped red onion
1/4 tsp minced garlic
1/2 cup dry bread crumbs
1/2 cup shredded mozzarella cheese
1 Tbsp minced fresh mint
1/2 tsp salt
3 Tbsp grated Parmesan cheese

Cut zucchini in half lengthwise; scoop out pulp, leaving 1/4" shells.  Brush with 2 tsp oil; set aside.  Chop pulp.  In a large skillet, saute pulp and onion in remaining oil.  Add garlic; cook 1 minutes longer.  Add bread crumbs; cook and stir for 2 minutes or until golden brown.

Remove from the heat.  Stir in the mozzarella cheese, mint and salt.  Spoon into zucchini shells.  Sprinkle with Parmesan cheese.  Grill, covered, over medium heat for 8-10 minutes or until zucchini is tender.