Crispy Vegetable Cakes (Croquettes de Legumes)

Name: Crispy Vegetable Cakes (Croquettes de Legumes)
Ingredients: 1 small leek; 1 large Yukon gold potato, grated; 1 large zucchini, grated; 3 large eggs, lightly beaten; 1 cup shredded cheddar cheese; 1 cup grated Parmesan cheese; 1/4 cup panko bread crumbs; flake sea salt and ground pepper to taste