Sweet Potatoes: 1 Great Sandwich

Name: Sweet Potatoes: 1 Great Sandwich
Prep time: 20 min
Cook time: 15 min
Ingredients: 1 medium sweet potato (boiled); 2 slices of multi-cereal loaf; 1 tbsp green onion (chopped); 1 tbsp goat cheese (small pieces); butter (a cube ); 2 walnuts (cores); salt, (a pinch)