Preheat your oven to 375°F (190°C) and lightly grease a small individual-sized baking dish with a touch of olive oil or ghee.
Tear or dice the small croissant into 1-inch pieces and chop the lean deli ham into bite-sized squares.
In a medium mixing bowl, whisk together the large egg, egg whites, unsweetened almond milk, sea salt, black pepper, and garlic powder until the mixture is smooth and well-combined.
Place the baby spinach at the bottom of the prepared baking dish, then layer the croissant pieces and ham over the greens.
Pour the egg mixture evenly over the croissant and ham layers, pressing down slightly with a spoon to ensure the bread absorbs the liquid.
Shred or tear the Swiss cheese and sprinkle it evenly over the top of the dish.
Bake for 25 to 30 minutes, or until the egg is set in the center and the cheese is golden and bubbly.
Remove from the oven, garnish with freshly chopped chives, and let it cool for 5 minutes before serving.