Heat oven to 400 degrees. Prepare hash brown potato nests. Put hash browns in a bowl. Drain off any liquid from thawing process. Toss potatoes with 1 beaten egg and 1/2 teaspoon salt. Generously spray a cupcake/muffin tin with non stick cooking spray. Press about 1/4 cup potato mixture firmly and evenly against bottom and side of 10 of the muffin cups. Place muffin tin on a cookie sheet. Cook until the edges are brown and crisp, about 35 to 37 minutes. Remove from oven and loosen the edges. (I used a small paring knife to loosen around the edges.) Let cool for about 5 minutes, then remove from cups and cool completely.
For the salad: Mix together chopped ham, mayonnaise, pineapple, celery, onion, mustard, and garlic powder. Refrigerate for about an hour. Fill potato nests with salad. Store in refrigerator til serving.