Stir together soy sauce, hoisin sauce, sesame oil, sugar, garlic, and crushed red pepper in a small bowl and set aside.
Heat oil in a large, nonstick skillet over medium high heat. Add the beef and cook until it is no longer pink, about 2 minutes.
Add onions and red bell peppers and saute until they are softened, about 5 minutes.
Pour in sauce and stir fry for about a minute or two.
Place two toasted french bread slices on a plate. Top with the beef, sauce, onions and red peppers. Top with sliced pepper jack cheese. Place plate in the microwave for about 30 seconds or until cheese melts. Serve and enjoy!