Add tomatoes, onion, green pepper, jalapeño (if using), garlic, tomato paste, salt, pepper, olive oil, and cumin to a 11x7 oven-safe dish.
2 cups grape tomatoes, 2 cloves grated garlic, 1 teaspoon salt, 1/2 teaspoon ground black pepper, 1 Tablespoon tomato paste, 2 Tablespoons olive oil, 1 green pepper, 1/2 medium onion, 1 jalapeño, 3/4 teaspoon ground cumin