In a large mixing bowl, combine the diced ham, shredded cheese, mayonnaise, mustard, chopped celery, chopped green onions, garlic powder, black pepper, and salt (if using).
Mix Well:
Stir all the ingredients together until well combined. You can use a fork or a spatula to mix everything thoroughly.
Adjust Seasoning:
Taste the spread and adjust the seasoning as needed, adding more salt, pepper, or mustard to suit your preference.
Chill:
Cover the bowl with plastic wrap or transfer the spread to an airtight container. Refrigerate for at least 30 minutes to allow the flavors to meld together.
Serve:
Serve the ham and cheese salad spread chilled with crackers, bread, or vegetable sticks. It also makes a great sandwich filling.