Combine the first seven ingredients in a mixing bowl and mix thoroughly until combined. Meanwhile, preheat a large Dutch oven over medium heat; add olive oil. Using wet hands, carefully roll out 12 meatballs of equal size and add to the Dutch oven, browning 1 - 2 minutes per side. Add spaghetti sauce, reduce heat to low, cover and simmer for 30 minutes. To assemble, add one meatball to each bun along with sauce. Top with provolone cheese and basil. Serve immediately.