Boil macaroni in well-salted water until tender, 7–9 minutes. Drain and rinse under cold water to cool.
If needed, cook eggs: simmer in water 10 minutes, then chill, peel, and chop.
Whisk mayonnaise, mustard, sugar, vinegar, milk, celery seed, salt, and pepper in a bowl until smooth.
Combine cooled macaroni, celery, onion, bell pepper, relish, and chopped eggs in a large mixing bowl.
Fold in the dressing until everything is evenly coated. Taste and adjust seasoning.
Cover and chill at least 1 hour to meld flavors. Dust with paprika before serving.
Notes
Stir in 1/2 cup diced cheddar or a handful of thawed peas for a twist. For make-ahead, keep the dressing separate and toss just before serving. Refrigerate leftovers in an airtight container for up to 3 days.This recipe is an original creation inspired by classic Amish Macaroni Salad Recipe flavors. All ingredient ratios and instructions are independently developed.