Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and dice the sweet potato into small cubes, then toss with olive oil and a pinch of sea salt.
Spread the potatoes on the baking sheet and roast for 20-25 minutes until the edges are golden and tender.
While the potatoes roast, cook the turkey bacon in a non-stick skillet over medium heat until it reaches your desired crispness.
Remove the bacon, chop it into small pieces, and set aside.
In the same skillet, add the diced red onion and sauté for 2 minutes, then add the spinach and cook until just wilted.
Whisk the egg whites briefly and pour them into the skillet over the vegetables, tilting the pan to cover the surface.
Once the egg whites are set, sprinkle the crispy turkey bacon over one half and fold the omelet over.
Slide the omelet onto a plate and serve immediately alongside the roasted sweet potatoes.