Preheat your oven to 350°F (175°C).
In a large skillet, heat olive oil over medium heat. Sauté mushrooms for about 5 minutes until browned. Add garlic and cook for another minute. Stir in spinach and sauté until wilted.
In a mixing bowl, whisk together eggs and milk until combined.
Combine the sautéed vegetables with the egg mixture, add green onions and 3 ounces of goat cheese, mix well.
Grease the baking dish with olive oil, then pour the mixture in, spreading evenly.
Crumble the remaining goat cheese over the top.
Bake for 35-40 minutes until the center is set and top is golden.
Let cool slightly, garnish with chives if desired, cut into squares, and serve warm.
