Wash the chicken breasts and pat dry. Carefully slice them into half, horizontally so you get thinner 'sheets' of each breast piece.
Marinate all the pieces lightly with salt and place them on a large baking sheet that has been lightly greased with olive oil or butter.
Heat some oil in a wok/kadai and fry the chopped onions till translucent, add the minced garlic and fry on a reduced heat for a few seconds. Don't let the garlic burn or it will taste bitter. Remove the mixture onto a plate and let it cool.
Spread the butter on each piece of the sliced chicken breast and add the prepared filling across the length of the chicken. Then add the Italian seasoning and/or garlic salt (if you are using garlic salt make sure you don't add too much as the chicken is already marinated with salt in step#2)
Sprinkle the grated cheeses and chopped coriander.
Roll up the chicken from the broadest side first and secure the ends using toothpicks. Drizzle with olive oil or brush with extra butter.
Preheat oven to 220 C and cook the chicken on 'bake' mode for 12 minutes. Then change the oven setting to 'grill' mode for another 8-9 minutes or till it looks golden on the surface.
Remove from oven and carefully remove the toothpicks. Serve hot with mashed potatoes or any side of your choice.