Creating Cucumber Tuna Salad Bites is exceptionally straightforward when you follow these simple steps:

1. Prepare the Cucumber: Wash the cucumber thoroughly. Cut it into 1/2-inch thick slices. Set aside.

2. Make the Tuna Salad: In a medium bowl, combine the drained tuna, mayonnaise, Greek yogurt, Dijon mustard, and lemon juice. Mix well until creamy.

3. Add Vegetables: If using, fold in the diced celery and red onion into the tuna mixture for added crunch and flavor.

4. Season: Sprinkle in salt and pepper to taste. If desired, add fresh herbs for an extra flavor boost.

5. Assemble the Bites: Place a generous spoonful of the tuna salad mixture on each cucumber slice.

6. Garnish: Top each bite with a sprinkle of fresh herbs or a dash of paprika for a pop of color.

7. Chill (optional): For best flavor, refrigerate the assembled bites for about 10-15 minutes before serving.

These simple instructions will help you create a delightful and healthy appetizer in no time!