Trim fat from steak; cut steak into 1-inch pieces. Coat a Dutch oven with cooking spray; place over medium-high heat until hot. Add steak; cook 4 minutes or until browned on all sides, stirring frequently. Drain and pat dry with paper towels. Wipe drippings from Dutch oven with a paper towel.
Coat Dutch oven with cooking spray. Place over medium-high heat until hot. Add onion and garlic; saute until tender. Add oregano and cumin; cook, stirring constantly, 1 minute. Add chili powder, cocoa, and salt, and cook mixture, stirring constantly, 1 additional minute. Add steak, beef broth, and tomatoes; bring to a boil. Cover, reduce heat, and simmer 1 1/2 hours or until beef is tender.
Uncover; add corn and red pepper, and simmer 20 additional minutes.
To serve, ladle into individual serving bowls; sprinkle with cilantro, if desired.