Preheat the oven to 450 degrees F.
Heat the extra-virgin olive oil in a pot over medium-high heat. Add the zucchini, onions, garlic, chile, celery, cubanelle pepper, red bell pepper, and salt and pepper, to taste. Cook about 10 to 12 minutes to soften vegetables. Add in the olives, raisins, and capers once the veggies start to give off their juice. Add the vinegar, then tomato sauce. Reduce heat to a simmer. Stir in the parsley and basil to finish.
Arrange bread on a large baking sheet and top with an even, thick layer of caponata. Then top that with an even layer of cheese and bake for 5 minutes to brown and melt the cheese. Cut each 1/2 loaf into 3 large squares of bread pizza.
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