Steps
1. In a bowl, whisk the eggs with a pinch of salt and pepper until well blended.
2. Heat the olive oil in a non-stick skillet over medium heat.
3. Add the sliced mushrooms and sauté until they are golden brown, about 5 minutes.
4. Stir in the sliced olives and cook for another 2 minutes.
5. Pour the whisked eggs over the mushrooms and olives, ensuring even distribution.
6. Cook for about 3-4 minutes until the edges start to set, then sprinkle the cheese on top.
7. Cover the skillet and let it cook for another 3-5 minutes on low heat until the eggs are fully set and the cheese is melted.
8. Slide the frittata onto a plate, cut into wedges, and drizzle with ketchup before serving.