Found this in Taste of Home Healthy Cooking. They state there are 301 calories per serving and only 12 grams of fat! Submitted by Kathy Vanderburg from Niceville, Florida. Had to save....we're both from Northwest Florida! Important....you are halving the marinade between the steak and the mushrooms! Prep and cook time does not include the hour marinating time. I did change the cooking time, as I do not prefer my steaks well done.
Combine the soy sauce, bourbon and brown sugar. Pour 1/3 cup into a resealable plastic bag; add steak. Seal and chill 1 hour.
Remove and discard the stems and gills from the mushrooms. Place in a shallow dish; brush both sides with the remaining marinade; cover and let stand for 1 hour.
Combine the peppers, onion, oil and 1/4 tsp each salt and pepper. Spread on a grilling grid; place on the grill rack. Grill, covered, over medium heat for 5-8 minutes or until crisp-tender. Cover and keep warm.
Sprinkle the steak with the remaining salt and pepper. Grill, covered, over medium heat for 5 minutes on each side, or until 145° for medium-rare, 160° for medium, or 170° for well done. Remember your steak will continue to cook a bit after removing from the heat.
Grill the mushrooms, covered, over medium heat for 6-8 minutes, turning once. Spoon the pepper mixture equally into the mushrooms.
Cut the steak into slices, and arrange over the the bell pepper mixture. Top with the cheese. Grill, covered for 3 minutes or until the cheese is melted.