In a large bowl, combine the drained white beans, cherry tomatoes, cucumber, bell pepper, red onion, and parsley. Toss gently to mix the vegetables evenly.
In a separate small bowl, whisk together the olive oil, red wine vinegar, Dijon mustard, minced garlic, salt, and pepper until well combined.
Pour the dressing over the bean and vegetable mixture. Toss gently to coat all the ingredients with the dressing.
Taste and adjust seasoning if necessary. For best flavor, let the salad sit for at least 30 minutes at room temperature or refrigerate for up to 2 hours before serving.
Serve chilled or at room temperature, and enjoy!