Add garlic, and saut until mushrooms are lightly browned and liquid almost evaporates (about 5 minutes). Stir in sherry and soy sauce; cook for 30 seconds or until liquid almost evaporates.
Place mushroom mixture in a medium bowl. Stir in the remaining 1/8 teaspoon salt, sour cream, half-and-half, and goat cheese. Spoon about 2 teaspoons mushroom mixture into each phyllo shell.