Scoop out both sides of the avocado flesh into a small bowl. Add ¼ teaspoon lemon juice, salt, and pepper. Lightly mash the avocado with a fork, leaving some chunks.
Spread the cream cheese over the toasted bread slices. Evenly spread the avocado mixture onto the toast.
Layer slices of tomato on top. Add pieces of smoked salmon, spring onions, capers. Season with black pepper.