Prepare the dressing first. In a small bowl, combine the olive oil, lemon juice, minced garlic, salt, and pepper. Set the dressing aside.
Rinse and drain the canned beans. Allow them to drain while you prepare the rest of the ingredients.
Finely chop about 1 cup of fresh parsley (about ½ bunch). Cut the grape tomatoes in half.
Add the drained beans, chopped parsley, tomatoes, and 2 oz. feta cheese to a bowl. Pour the prepared dressing over top, then stir to combine. Serve immediately or refrigerate up to four days.