Boil potatoes until tender, then cube.

Boil eggs until hard-boiled, then grate.

Chop onion.

Combine cubed potatoes, grated eggs, and chopped onion in a large bowl.

In a separate bowl, mix mayonnaise with Good Seasons dressing mix, garlic salt, and pepper.

Add the mayonnaise mixture to the potato mixture.

Adjust mayonnaise amount to desired creaminess.

Mix well to combine all ingredients.

Refrigerate for at least 30 minutes before serving to allow flavors to meld.