Your new favorite light and creamy mac potato salad. Have it ready for your next cookout!
Cube and cook red potatoes.
Cook macaroni according to package directions; drain.
Put potatoes and macaroni in a large bowl.
Add diced onion to large bowl with the macaroni, potatoes.
Separate egg yolks from egg whites.
Chop egg whites; put them into the large bowl with the macaroni and potatoes.
In a medium bowl, mash yolks and mix with 6 cups mayonnaise. Stir in salt, pepper, Dijon mustard and vinegar.