If you cannot find herb butter in your market, use 1 tablespoon chopped fresh herbs such as basil, parsley or oregano with the 1/4 cup butter. If you are using dried herbs, use only 1 teaspoon.
If you do not have a decorating bag, substitute a resealable food-storage plastic bag and cut off one bottom corner.
If you would like your potatoes to have a little texture, once you have piped the potatoes onto the meat loaves, place the muffin pans under the broiler for 2 to 3 minutes.
You can use foil muffin cups to line the pans for easy removal of the meat loaves, if desired.