Preheat oven to 375°F (190°C). Grease a medium-sized baking dish or casserole with a bit of olive oil.
Sauté vegetables (optional) – Lightly sauté spinach, asparagus, and green onions in a pan with olive oil for 2–3 minutes to soften slightly.
Whisk eggs in a large bowl with almond milk, thyme, salt, and pepper.
Combine and pour – Add sautéed veggies to the egg mixture, stir to combine, then pour into the prepared baking dish.
Bake for 30–35 minutes or until the center is set and the edges are lightly golden.
Cool slightly, garnish, and serve warm.