Asiago Cheese Ham, Chicken and Potato Casserole

large Yukon Gold potatoes (yellow, peeled and cut into thin slices)

boneless skinless chicken breasts (cut into cubes)

slices of ham (cut into squares)

butter (equals to 1/2 stick or 4 tablespoons)

heavy cream

shredded Asiago cheese (can use Cheddar too)

stalk scallions (green part cut into small circles)

Salt

Pepper