How to Make It
Place racks in upper and lower thirds of oven; preheat to 375ºF. Coat 16 cups of two 12-cup nonstick muffin tins with oil.
In a pan, bring broth to a boil. Stir in quinoa, reduce heat, cover and simmer until liquid has absorbed, 12 to 15 minutes. Remove from heat; let stand, covered, for 5 minutes. Transfer to a large bowl.
In a large, deep skillet, melt butter with 1 Tbsp. oil over medium-high heat. Stir in half of mushrooms and 1/2 tsp. salt; sauté until golden, about 8 minutes. Transfer to bowl with quinoa. In same skillet, warm 1 tsp. oil. Sauté onion, celery, garlic, 1 tsp. salt and pepper over medium heat until softened, about 8 minutes. Add kale by the handful and cook, stirring, until just wilted, about 5 minutes. Season with salt. Add to bowl; stir in eggs, cheese and herbs. Spoon into muffin tins, pressing in and mounding on top. Press in nuts.
Bake, switching pans halfway through, until heated through, about 25 minutes. Let cool slightly. Remove from tins; serve.