Begin by gathering your ingredients. In a mixing bowl, use a hand mixer to blend the softened cream cheese and mayonnaise together until the mixture is smooth and creamy, about 2-3 minutes. Then, add the lemon zest, lemon juice, onion powder, garlic powder, dill, salt, and pepper to the bowl, mixing again until everything is well combined and tastes delicious.

Next, take your soft brioche bread and lay out six slices on a clean cutting board. Use a butter knife to evenly spread the creamy mixture you just made onto each slice, making sure to cover the surface completely.

Wash and thinly slice the cucumber using a sharp knife or a mandoline slicer, aiming for approximately 1/8-inch thickness. Place the cucumber slices on half of the prepared bread slices, optionally sprinkling fresh dill on top.

Gently place the remaining slices of bread onto the layered cucumbers to complete your sandwiches. Trim the crusts off if desired and cut each sandwich into thirds or quarters for easy serving.