Use a non-stick pan to make flipping the tortilla easier and prevent sticking. Cook the potatoes slowly in olive oil to soften them without browning. Don’t rush the cooking process—low and slow is key. Use a plate slightly larger than your skillet to flip the tortilla without breaking it. Allow the tortilla to rest after cooking; it will continue to set and become easier to slice. You can prepare the potato and onion mixture ahead of time and refrigerate it to speed up the final cooking step. Variations include adding cheese like Manchego, vegetables such as bell peppers or spinach, herbs like parsley, spices such as smoked paprika, or meats like chorizo.