Using tongs, char red peppers over open stove flame. Turn frequently to get a uniform blackened and blistered skin. Allow to cool, remove stem and seeds and place in a blender, leaving skins on. Add tomato sauce, puree and set aside.
Simmer onions in olive oil until soft, 2-3 minutes. Add ground beef and simmer until no pink remains, breaking into small pieces as it cooks, about 3 minutes.
Transfer to a mixing bowl. Stir in banana peppers, 1-1/2 cups of cheese, salt, parsley and olives. Preheat oven to 350 degrees.
Spread a third of the sauce in a large rectangular baking pan. Stuff each manicotti with beef mixture, line in pan and cover with remaining sauce. Cover with aluminum foil and bake for 30 minutes.
Remove foil, top with remaining 1/2 cup cheese and bake an additional 20 minutes until bubbly. Allow to set for 5 minutes before serving.
Roasted pepper tip: Another way to roast peppers is to seed and quarter, place skin-side up under broiler until charred.
Make-ahead tip: Assemble up to 2 days before. Bake the day of, adding 10 minutes to cook time.
All materials courtesy of Certified Angus Beef. For more information, visit www.certifiedangusbeef.com and follow on Facebook and Twitter, or read the brand’s blog at www.gorare.com