Combine all of the vinaigrette ingredients into a jar or small bowl and whisk together until combined. Set aside.
Cut the bread into bite size cubes. Heat a large pan on medium heat and add olive oil and bread cubes. Toast bread for about 10 minutes, or until bread is crispy on the outside.
Add all of the diced vegetables, bread cubes, and the feta cheese into a large bowl. Slowly add the vinaigrette and mix until everything is combined.