Step-by-Step Instructions
Prep the Ingredients:
Peel and thinly slice the potatoes and onion.
In a large mixing bowl, whisk the eggs until well combined and season with salt and pepper. Add grated cheese if using.
Cook the Potatoes and Onions:
Heat olive oil in a large non-stick skillet over medium heat.
Add the sliced potatoes and onions to the skillet. Cook for about 10-12 minutes, stirring occasionally, until the potatoes are tender and slightly golden.
Combine the Mixture:
Pour the egg mixture over the cooked potatoes and onions, making sure to distribute it evenly.
Reduce the heat to low and cook for an additional 5-7 minutes, or until the edges start to set.
Finish Cooking:
If your skillet is oven-safe, transfer it to a preheated oven at 350°F (175°C) and bake for about 10-15 minutes until the frittata is set and lightly browned on top. If not, you can cover the skillet with a lid and let it cook on the stove until fully set.
Cool and Serve:
Once cooked, remove the frittata from the oven (or stove) and let it sit for 5 minutes before slicing.
Garnish with fresh herbs if desired and serve warm or at room temperature.