Mix together the ricotta, breadcrumbs, milk, oregano, salt, chili paste and egg in a medium bowl to combine. Add the beef, Parmesan and parsley and mix just to combine. Form a scant 1/4 cup of meat mixture around the top part of a skewer. Continue with the remaining meat mixture and skewers.
Grill the kababs until deep brown and cooked through, about 4 minutes per side. Remove to a platter and serve with the warmed marinara.