Preheat skillet over medium heat. Spray pan with nonstick release spray.
Sauté onions and peppers until softened.
To assemble sandwich, layer each hoagie with 1 1/2 ounces roast beef and 1/4 cup vegetable mixture. Ladle each sandwich with 1 1/2 ounces Ultimate White Cheese Sauce Blend.
CCP: Heat to 165°F for at least 15 seconds
CCP: Maintain hot food at 135°F or above