Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a touch of olive oil.
In a small skillet over medium heat, add the olive oil and sauté the diced sweet potatoes until they are tender and slightly golden.
Add the fresh spinach to the skillet and toss until just wilted, then remove the pan from the heat.
In a medium mixing bowl, whisk together the large eggs, egg whites, sea salt, and black pepper until the mixture is well combined and frothy.
Spread the sautéed sweet potatoes and spinach evenly across the bottom of the prepared baking dish.
Pour the egg mixture over the vegetables, ensuring they are mostly submerged and evenly distributed.
Brush each slice of bacon with the pure maple syrup and lay them gently across the top of the egg mixture.
Place the dish in the oven and bake for 20-25 minutes, or until the eggs are set and the bacon is beautifully crispy.
Remove from the oven, sprinkle with the crumbled feta cheese, and let it rest for 2 minutes before serving.