Step 1: Preheat your oven to 375°F (190°C). Lightly grease a baking dish.
Step 2: Wash the zucchinis and cut them in half lengthwise. Using a spoon, carefully scoop out the pulp, leaving about 1/4 to 1/2 inch of flesh around the edges to form the 'boats'. Reserve the pulp.
Step 3: Place the hollowed zucchini halves in the prepared baking dish. Sprinkle the insides lightly with a pinch of salt.
Step 4: Heat the olive oil in a large skillet over medium heat. Add the chopped onion and cook until softened, about 3-5 minutes. Add the minced garlic and cook for another minute until fragrant.
Step 5: Add the ground beef (or turkey) to the skillet. Break it up with a spoon and cook until browned, about 5-7 minutes. Drain any excess grease.
Step 6: Stir in the finely chopped zucchini pulp, marinara sauce, oregano, the remaining 1/2 teaspoon salt, and black pepper. Simmer for 5-7 minutes, allowing the flavors to meld. Remove from heat.
Step 7: Stir in the 1/2 cup mozzarella cheese and Parmesan cheese into the meat mixture until just combined.
Step 8: Evenly divide the meat filling among the zucchini boats, piling it slightly high. Sprinkle additional mozzarella cheese on top of each filled boat.
Step 9: Bake for 25-30 minutes, or until the zucchini is tender and the cheese is melted and bubbly. The exact cooking time for these zucchini boat recipes may vary depending on the size of your zucchini.
Step 10: Garnish with fresh chopped parsley before serving. Enjoy these delicious zucchini boat recipes warm!