Stuffed zucchini

Ingredients 4 medium zucchinis 1 lb (450g) ground beef, turkey, or sausage (you can substitute with plant-based meat for a vegetarian version) 1 cup cooked rice or quinoa (optional for added texture) 1 small onion, finely diced 2 garlic cloves, minced 1 cup marinara or tomato sauce (plus extra for serving) 1 cup shredded cheese (mozzarella, cheddar, or your favorite blend) 1/4 cup grated Parmesan cheese (optional) 1 tsp Italian seasoning 1/2 tsp paprika 1/2 tsp salt (or to taste) 1/4 tsp black pepper 2 tbsp olive oil Fresh parsley or basil, chopped (for garnish)