Cook the quinoa and lentils as directed, if not using precooked. Set aside to cool completely.
Preheat the oven to 375°F. Lightly grease a 9x13" casserole dish and set aside.
In a large skillet, warm the olive oil over medium heat. Add the onion and cook until translucent, for about 3-5 minutes. Next, add the spinach and garlic. Cover with a lid and continue to cook for another 5 minutes, stirring intermittently, or until the spinach has wilted. Remove from heat and set aside to cool.
In a large bowl, whisk together the eggs, yogurt and feta cheese. To the bowl, add the cooked and cooled quinoa, lentils, onion/garlic/spinach mixture, cherry tomatoes, fresh dill, salt & pepper. Toss until evenly combined.
Transfer to the greased casserole dish, spreading it out to the sides of the dish, until even on the surface. Bake 35-45 minutes, or until light golden brown on top. Allow to cool for at least 10-15 minutes before serving. Leftovers can be stored in an airtight container for up to 1 week.
Notes
Nutrition Facts are for 1/4th of recipe and may vary depending on the brands or specific ingredients you choose.