Heat a large nonstick fry pan with a medium heat and add in the olive oil

While the oil is heating, cut the potatoes (peeled) into small bite-sized pieces that are a 1/4 inch (.625 cm) thick and roughly chop the onions

Add the chopped onions into the hot fry pan, mix continuously, after about 4 minutes add in the chopped potatoes, mix together, then mix every 3 to 4 minutes so everything evenly cooks

In the meantime, crack the eggs into a large bowl, season with sea salt & black pepper and whisk together, cut the manchego cheese into thin slices, cut the roasted red bell pepper into thin strips, and cut the baguette into diagonal slices that are 1/2 inch (1.25 cm) thick

After 20 to 25 minutes and the potatoes are golden fried and cooked through, season with sea salt & black pepper, mix together, then transfer everyting into the bowl with the whisked eggs, reserving the olive oil in the pan, mix together and then let the mixture sit for 3 to 4 minutes

In the meantime, heat the same fry pan with the reserved olive oil with a low-medium heat (you want about 2 tbsp - 30 ml olive oil in the pan)

After a couple of minutes add in the potato and egg mixture, making sure it's all in a flat layer and evenly distributed

After 4 to 5 minutes it's time to flip the omelette, add a plate that's slightly smaller than the pan over the omelette, in one swift move flip the pan into the plate, slide the omelette back into the pan, using the back of a spatula compact the omelette from the outer edges towards the center, this gives it that classic rounded edge, go for another 3 to 4 minutes or until the eggs are cooked through, then transfer the omelette over a cutting board

To assemble, add the slices of baguette over a serving dish and top each one off with a slice of manchego cheese, then cut the omelette into pieces that are slightly bigger than the slices of bread, add each piece over a slice of bread, top off with some strips of roasted red bell pepper and chopped parsley, pierce each one with a toothpick to hold everything together, serve warm, at room temperature or even chilled, enjoy!