Cheesy Cod Fish Balls

Name: Cheesy Cod Fish Balls
Ingredients: 2 small-medium russet potatoes, peeled and cut into 1 inch chunks ((about 2 cups mashed potatoes)); 550-600 g cod filets, cut into large chunks; 2 garlic cloves, pressed; 1 medium yellow onion, grated and juices squeezed out; 1 1/2 tsp kosher salt; 1/2 tsp pepper; 2 tbsp finely chopped parsley; 1 tbsp finely chopped mint; 1 tbsp finely chopped dill; 1 tbsp extra virgin olive oil; 1 cup panko breadcrumbs; zest of 1 lemon; 2 eggs, whisked; 30-32 small cubes of mozzarella cheese (about ½ inch squares); avocado oil for frying