Mushroom Quinoa Frittata

I added another cook book to my library from Costco this time. It is called 500 Best Quinoa Recipes by Camilla Saulsbury. I loved the book and have been making some of recipes already and wanted to give it a try to this one.  

Ingredients:
8-inch square glass baking dish, sprayed with olive oil
Preheat oven to 350F (180C)

6 large eggs
1/2 tsp fine sea salt
1/4 tsp freshly ground black pepper
2 tsp olive oil
8 oz. cremini or button mushrooms - sliced
1 1/2 cups chopped green onions
1 1/2 cups cooked quinoa - cooled
1/4 cup freshly grated parmesan cheese

In a large bowl, beat eggs, salt and pepper until blended. Set aside
In a large skillet, heat oil over medium-high heat. Add mushrooms and green onions; cook, stirring, for 5 to 7 minutes or until softened. Stir in quinoa and cook, stirring, for 1 minute.
Spread quinoa mixture in prepared baking dish and pour egg mixture over top. Sprinkle with cheese.
Bake in preheated oven for 23 to 28 minutes or until golden and set. Let cool on a wire rack for at least 10 minutes before cutting. Serve warm or let cool completely.