Preheat the oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Place the diced red potatoes on the sheet, drizzle with olive oil, and sprinkle with sea salt, black pepper, and garlic powder.
Toss the potatoes to coat evenly and roast for 15 minutes until they start to soften.
Add the diced bell peppers and red onions to the baking sheet, tossing them with the potatoes, and roast for another 12 minutes until the edges are golden and crispy.
While the vegetables finish roasting, whisk the whole eggs and egg whites together in a medium bowl until well combined.
Heat a non-stick skillet over medium-low heat and pour in the egg mixture, stirring gently with a spatula until the eggs are soft-scrambled and just set.
Fold the roasted potato and vegetable mixture into the skillet with the eggs to combine.
Serve the hash warm, topped with a dollop of non-fat Greek yogurt and a sprinkle of fresh chives.