2
Spread the butter on each slice of bread on one side, about 1/2 teaspoon. Add the spinach and artichoke mixture to the non-buttered sides of the bread. Layer in the turkey if using.
3
Heat a skillet over medium heat. Once hot, add the sandwich and cook until the bread is golden brown. Flip the sandwich and repeat on the other side until the bread is golden brown and the cheese and filling are warm and melted.