Preheat the oven to 375 degrees. Line a baking sheet with foil, then coat it with cooking spray.
Place the tomato halves on the baking sheet, then slide slivers of garlic stuck into each tomato half.
Season the tomatoes with onion powder, oregano, crushed red pepper flakes, sea salt, and freshly cracked pepper, to taste, along with a drizzle of olive oil.
Place into the oven and roast for 35-45 minutes, or until soft and juicy.
Remove them from the oven and pour the tomatoes and juices into a large saucepan along with the tomato paste. Simmer over low heat until the tomatoes reduce, about 10 minutes.
Blend with an immersion blender until smooth.
Place the lid halfway on the pan and continue to simmer until the sauce reduces enough to coat the back of a spoon, about 5-7 minutes. Taste and re-season, if needed.
Add the fresh chopped basil to the sauce and stir to combine. Let cool.
Spread the sauce on the pizza dough as needed, then store it in the refrigerator or freezer.