1Make the cheese sauce: Melt butter in a pan, add flour, mix until it forms a paste, add milk and whisk, then add salt, pepper, truffle pesto, garlic powder, red leicester cheese and cheddar cheese.
2Prepare the chicken: Butterfly the chicken breasts, season with flour, salt, pepper and garlic powder, dip in egg, then in breadcrumbs and parmesan.
3Fry the chicken breasts in a pan with oil for about 4 minutes until golden brown.
4Make the tomato sauce: Fry minced garlic in a pan, add passata, salt, pepper and fresh basil.
5Assemble the sandwich: Spread tomato sauce on bread, add sliced chicken, mozzarella cheese, mac and cheese, chives, crispy onions, and more cheese sauce.