Combine goat cheese, half-and-half, horseradish, dill, garlic powder and pepper in a small bowl. Stir with a rubber spatula until smooth and creamy.
Spread the goat cheese mixture on 1 side of each bread slice. Top 1 slice with cucumber, sprouts, onion rings, bacon and tomato. Top with the remaining bread slice, cheese-side down. Slice the sandwich before serving.
