Remove the corn kernels from the cob. Bring a pot of salted water to a boil; add the corn and cook for 3 to 4 minutes. Strain, then set aside to cool.
In a large serving bowl, combine the greens, tomatoes, avocado, and corn.
Make the dressing by whisking the miso, vinegar, and olive oil into a bowl. Dress the warm beans with it and mix to incorporate.
Add the dressed beans to the salad and stir to combine. Taste and adjust the seasonings. Top with fresh basil, if desired. This salad can be served at room temperature or slightly chilled.
