What you'll need.
Melt butter in a large skillet over medium heat.
Add dried beef and sauté about five minutes.
Until it develops a few crisp edges.
Stir in the flour and cook until it just begins to color, about 3 minutes.
Slowly whisk in the warmed milk & half and half, pepper, chives, and nutmeg. Continue cooking, stirring constantly, until thickened and creamy but still pourable, about 5 minutes.
Ladle over toast, scatter with parsley & serve. (I omitted the parsley)