Preheat oven to 350°F and line a sheet pan with parchment paper.
In a medium bowl mix sorghum, spinach, Parmesan cheese, mozzarella and pepper. Set aside.
Place the mushrooms on the sheet pan and season with salt. Stuff the mushrooms evenly with the sorghum and spinach mixture, and top each mushroom cap with smoked Gouda. Bake for 15 minutes. When done, remove from oven and serve warm.
Serving size: 1 mushroom, Calories: 50 calories, Fat: 2.5 grams, Saturated fat: 1.5 grams, Carbohydrates: 3 grams, Sugar: 0.5 gram, Sodium: 125 milligrams, Fiber: 1 grams, Protein: 5 gram, Cholesterol: 8 milligrams