Steps
1. Boil the diced potatoes in salted water for about 8 minutes until tender, then drain.
2. Heat olive oil in a small non-stick skillet over medium heat.
3. Add chopped onions and sauté until translucent, about 3 minutes.
4. Add the boiled potatoes and cooked rice to the skillet, stirring gently to combine and warm through.
5. In a bowl, beat the egg with salt and pepper.
6. Pour the beaten egg evenly over the potato, rice, and onion mixture in the skillet.
7. Cook on low heat until the egg is set around the edges but still slightly runny on top, about 4-5 minutes.
8. Carefully flip the frittata to cook the other side or finish under a broiler for 1-2 minutes until fully set.
9. Slide onto a plate, garnish with fresh herbs if desired, and serve warm.