In a small saucepan or medium-size skillet melt butter. Whisk in flour, salt, and pepper. Let cook over medium-low heat for about 1 1/2 minutes, stirring constantly. Slowly stir in broth, then milk or milk substitute. Whisk gently until blended and it begins to thicken. (Don’t give up, this will combine) Simmer for a few minutes. Add in place of condensed soup in the recipe.