Cook macaroni according to package directions. Drain. Boil and peel eggs. Place macaroni in a large bowl. Add mayonnaise, sweet pickles, onion powder, salt, pepper, and yellow mustard. Mix well. You may need to add more mayonnaise, depending on your preferences. Add chopped eggs. Lightly toss. Chill!Remember, if serving the next day, you will likely need to add more mayonnaise before serving because the noodles will soak up the mayonnaise as it sits.