Preheat the oven to 350F. Line a baking sheet with parchment paper.
Spread sourdough cubes out on the prepared baking sheet then coat with olive oil spray. Bake in the oven until they are just toasted, about 18-22 minutes, tossing halfway through.
Combine remaining ingredients in an extra large bowl then toss to coat. Add the toasted sourdough cubes when they are done and toss again to make sure everything is evenly distributed. Top with a little extra minced basil and serve!