Step 1
Peel and thinly slice the potatoes and onion. Heat olive oil in a large skillet over medium heat. Add the potatoes and onion and cook slowly until tender and lightly golden, stirring occasionally to ensure even cooking.
Step 2
Transfer the cooked potatoes and onion to a bowl. Drain excess oil if needed. Add eggs, salt, and black pepper to the bowl and mix thoroughly until all ingredients are evenly combined.
Step 3
Heat a nonstick skillet over medium heat. Pour the egg mixture into the skillet and spread evenly. Cook until the bottom is set and golden.
Step 4
Carefully flip the omelet and cook the other side until fully set in the center. Remove from heat and allow it to rest for several minutes before slicing into four equal portions.
Step 5
Slice the burger buns in half.
Step 6
Place lettuce on the bottom half of each bun.
Step 7
Add a slice of tomato.
Step 8
Place a portion of the Spanish omelet on top.
Step 9
Cover with the top bun and serve immediately while warm. Pair with a fresh salad or roasted vegetables for a complete meal.
