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Cheesy Broccoli Mushroom Quinoa Bake
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5 from 4 votes

Cheesy Broccoli Mushroom Quinoa Bake (Gluten Free)

This Cheesy Broccoli Mushroom Quinoa Bake is a classic bowl of comfort food perfect for any night of the week. Loaded with broccoli, mushrooms, cheese & quinoa.
Prep Time20 mins
Cook Time30 mins
Total Time50 mins
Course: Brunch/ Breakfast/ Dinner
Cuisine: American
Servings: 8
Author: Stephanie


  • 1 cup quinoa uncooked
  • 16 ounce bag frozen broccoli florets
  • 1 medium yellow onion chopped
  • 3 cloves garlic minced
  • 4 1/2 tbsp. butter divided
  • 1 tbsp. olive oil
  • 8 ounces mushrooms of choice sliced
  • 1 1/2 tbsp. corn starch
  • 1/2 cup plain greek yogurt full-fat
  • 1 1/2 cups half & half cream
  • 1/2 tsp. garlic powder
  • 1/4 tsp. dried mustard
  • 3 cups shredded cheddar cheese divided
  • salt & pepper to taste


  • Preheat oven to 350 degrees and butter 9 x 13 casserole pan with 1/2 tbsp. butter.
  • Rinse quinoa several times in cold water prior to cooking. See recipe notes.
  • Then add quinoa & 2 1/2 cups of water to medium saucepan. Bring to boil, reduce heat and cover. Cook 12-15 minutes till liquid absorbed. Set aside.
  • While quinoa is cooking steam broccoli florets on stove top about 7-8 minutes and set aside.
  • Meanwhile add 2 tbsp. butter & olive oil to skillet on stove top over medium heat. Add onion, garlic & cook 2-3 minutes.
  • Next add sliced mushrooms, salt & pepper and continue to cook about 5 more minutes.
  • Remove onion mushroom mixture from pan and set aside. Meanwhile in same pan add the remaining 2 tbsp. butter and corn starch to form roux. 
  • Add greek yogurt, half & half, garlic powder, & dried mustard. Continue to cook about 5-6 minutes until thickened. Pour the mushroom & onion mixture back into pan.
  • Add half of shredded cheddar cheese and stir till melted about 1 more minute.
  • Start by spooning cooked quinoa on bottom layer of buttered casserole dish and spread out evenly.
  • Next layer steamed broccoli florets, followed by mushroom sauce & top with remaining cheddar cheese.
  • Bake in preheated oven 30 minutes.


I used white cheddar cheese but could use cheese of choice.
I generally like to soak my quinoa in a bowl cold water for at 15- 20 minutes, then drain prior to cooking. But at least make sure to rinse well before cooking.