Stack the dried chipped beef slices on a clean cutting board. Using a sharp chef's knife, slice them into bite-sized strips or small squares roughly ½ inch wide. Pro Tip: If you are sensitive to salt, place the chopped beef in a colander and rinse it briefly under warm tap water, then pat it thoroughly dry with paper towels to strip away excess surface sodium.
Melt the 4 tablespoons of unsalted butter in a medium skillet set over medium heat until it bubbles gently.
Drop the chopped chipped beef straight into the hot butter. Sauté for 3 to 4 minutes, stirring frequently, until the edges of the beef begin to curl slightly and darken in color, infusing the butter with its smoky, cured essence.
Sprinkle the ¼ cup of all-purpose flour evenly over the beef and butter matrix. Stir constantly for 1 to 2 minutes with a wooden spoon or silicone spatula. The flour will absorb the butter completely, coating the meat and cooking out the raw starch flavor until it turns a light blonde color.
While stirring vigorously with one hand, slowly pour the warmed whole milk into the skillet with the other hand. Whisking continuously as you add the dairy ensures a perfectly smooth emulsion without any stubborn flour clumps.
Stir in the garlic powder, black pepper, and optional pinch of nutmeg. Do not add extra salt yet; the cured beef will naturally release a high volume of salt into the surrounding gravy baseline as it simmers.
Bring the mixture to a gentle simmer over medium heat. Reduce the flame to low and let it cook uncovered for 5 to 6 minutes, stirring frequently to prevent the milk sugars from scorching on the bottom of the pan. The gravy is ready when it thickens into a glossy, velvety consistency that completely coats the back of a spoon.
Taste the hot cream sauce. Adjust with an extra pinch of black pepper or a tiny speck of salt if preferred.
Lay your freshly toasted, warm bread slices flat on serving plates. Ladle a generous portion of the hot creamed chipped beef directly over the toast, allowing the gravy to cascade over the sides.
Scatter fresh chopped parsley across the top for a bright, texturized contrast and serve immediately while steaming hot.