Homemade Croquettes

Name: Homemade Croquettes
Prep time: 30 min
Cook time: 7 min
Total time: 37 min
Cuisine: Italian
Ingredients: 1 Carrot; 1 Onion; 4 Zucchini; 2 Medium sized potatoes; 400ml of Béchamel sauce ( 1 3/4 cup ); 300g of Breadcrumbs ( 2 cup ); 3 Eggs; 100g of White flour ( ½ cup + 2 tbsp ); 2 Tablespoons of extra virgin olive oil; Salt and pepper to taste; Oil for frying; 50g White Flour ( ¼ cup + 1 tbsp ); 50g Butter; 500ml of Milk