In a bowl add the cream cheese, mayonnaise, chives, dill, lemon juice, pepper, salt, and garlic powder. Mix until combined.
Spread the cheese mixture onto each half of the slices.
Place the cucumbers onto one slice of the bread. (You can remove crust on bread if desired)
Then place the other slice of bread on top of the cucumbers.
Cut into triangles or squares.
Serve immediately or place in the fridge for up to 24 hours before serving.
Garnish the sandwiches by sprinkling with dill before serving.