Preheat your oven to 400 degrees. Add your bread cubes to a baking sheet. Drizzle with some of the marinade from the Galbani marinated mozzarella. Season with a pinch of salt and the dried oregano.
Bake the croutons for 10 minutes until they are crispy and golden. Set aside.
Add your arugula, berries, tomatoes, and onions to a bowl and toss to combine.
Add your cheese and croutons.
Pour the dressing over the top and toss everything to thoroughly mix.