Cheesy Scalloped Potatoes

Russet potatoes (2 lbs)

Butter (1/4 cup)

All-purpose flour (1/4 cup)

Half and half (1 1/2 cup)

Salt (1/2 tsp (or to taste))

Pepper (1/4 tsp (or to taste))

Shredded Colby jack cheese (2 1/2 cups)

Optional: Fresh chives or fresh parsley for garnish