Add the olive oil into a bowl, along with the white wine vinegar, Dijon mustard, grated garlic, oregano, and season with salt & pepper, whisk together and set aside

Drain the jar of white beans into a colander and rinse under water, then shake off any excess water, and transfer the beans into a large bowl

Add the chopped red onion over the beans, along with the chopped cucumber, red bell pepper, sliced black olives, fresh mozzarella, and basil, then pour the dressing over the salad, season with salt & pepper, and gently mix together until well mixed

Serve at room temperature or chilled, as it will hold for up to 3 to 4 days in the fridge, enjoy!