Preheat the oven to 375 degrees. Coat a small baking sheet with olive oil cooking spray.
Place the tomato halves on the baking sheet.
In a bowl, combine panko crumbs, Parmesan cheese, olive oil, basil, sea salt, freshly cracked black pepper, and garlic powder to taste, and mix thoroughly.
Spoon crumb mixture on top of tomato halves, then spray them with olive oil cooking spray.
Place in the oven to bake for 45 minutes, until tomatoes are softened and the crumbs are golden brown. Enjoy!