Take a large-sized bowl and put the grounded sirloin in it. Make some space at the center and add a beaten egg in it along with the bread crumbs.
Add onion, garlic, red pepper flakes, Worcestershire sauce, parsley, and shredded cheese. Also, sprinkle the salt and pepper.
Mix all the ingredients until well combined. Roll the mixture into balls and then put the balls in a baking pan after you have greased the pan.
Cook for 10-15 minutes and then check if they are properly cooked.
After heating a saucepan on the stovetop, heat some oil and fry the minced garlic in the oil. Add the herbs and pepper and cook for a minute.
Add the tomatoes and again sprinkle salt and pepper to season the mixture. Boil and simmer the sauce.
Dip the cooked meatballs in the sauce. Top the dish with the shredded cheese and use the broiler to melt it. Sprinkle the chopped basil at the top and Serve.
You can also serve potato fried paired up with these meat and cheese balls.