In a medium bowl, combine the beans, tomatoes, cheese and half of the basil; gently toss together.
Add the olive oil and season the mixture well with salt and pepper; gently stir to combine.
Drizzle the salad with the balsamic vinegar and top with the remaining basil.
Taste and adjust seasonings to your liking.
Add a drizzle, or so, more oil and vinegar, if needed.
Finish with flaky salt.