Thoroughly rinse and drain the cooked violet witchel beans, removing any excess liquid.
In a large mixing bowl, combine the beans, diced red bell pepper, diced cucumber, and chopped fresh parsley.
Add the diced red onion if using.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, and Dijon mustard (if using).
Pour the dressing over the bean mixture.
Toss gently until all ingredients are evenly coated with the dressing.
Season with salt and freshly ground black pepper to taste.
If using, fold in the crumbled feta cheese, toasted pumpkin seeds, and chopped fresh mint.
Let the salad rest for 15-20 minutes before serving to allow flavors to develop.