Spanish-style sweet potato, mushroom and feta tortilla

Name: Spanish-style sweet potato, mushroom and feta tortilla
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: European, Mediterranean, Spanish
Ingredients: 12 British Lion eggs, beaten; 2 orange flesh sweet potatoes, peeled and cut into 2 cm dice; 180g feta cheese, diced; 16 button mushrooms, thinly sliced; 1 onion, halved and sliced; Olive oil; Salt; Pepper; Small pot of sour cream (about 150 ml); 6 spring onions, finely sliced; A little smoked paprika / paprika