Preheat broiler to low.
In a large bowl, add ground beef, romano cheese, breadcrumbs, parsley, rosemary, garlic, egg and olive oil. Season with salt and pepper. Using clean hands, mix until just combined. Roll 2 tablespoons of beef mixture in small balls. Transfer to a plate or pan.
Line a roasting pan with sliced dinner rolls. Broil until browned, about 3-5 minutes. Remove and set aside. Turn off broiler.
Preheat oven to 200 F.
Add pasta sauce to a small sauce pan and warm over medium-low heat.
Place a cast iron pan (or large saute pan) over medium heat and brush with olive oil. Once hot (mine took about 5 minutes), add meatballs and brown each side until cooked through, about 10-12 minutes. If needed, transfer cooked meatballs to oven until ready to serve.
Line a serving tray with sliced rolls. Spoon about 1 tablespoon warmed sauce over bottom of roll. Add meatball, monterey jack cheese and basil leaf.
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