Zucchini Spaghetti (With Meatballs)

Name: Zucchini Spaghetti (With Meatballs)
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: Italian
Ingredients: 1/3 cup Grated parmesan cheese ((or breadcrumbs of your choice)); 2 tbsp Heavy cream; 2 tbsp Onion ((grated and patted dry with paper towels)); 1 large Egg; 2 cloves Garlic ((minced)); 1 tbsp Fresh parsley ((chopped)); 2 tsp Italian seasoning; 1/4 tsp Sea salt; 1/4 tsp Black pepper; 1 lb Ground beef; 2 1/2 lb Zucchini ((about 8 medium)); 1 1/4 cup Marinara sauce ((divided into 3/4 cup and 1/2 cup)); 2 tbsp Grated parmesan cheese ((to taste))