Cheesy Wild Rice Broccoli Mushroom Casserole
A creamy baked casserole combining nutty wild rice with roasted broccoli, mushrooms, and red onion bound in a Dijon-spiked cheese sauce. The mixture is topped with melted Parmesan or cheddar and broiled until golden. A vegetable-forward comfort dish suitable for weeknight dinners or potlucks.
Ingredients
- ¾ cup cooked wild rice, mixture of black, red, brown rice
- ½ unit red onion, diced
- 2 clove garlic, minced
- 1 ½ cup broccoli or broccolini, chopped
- ⅝ cup mushroom, chopped, choose from crimini, shiitake, oyster, maitake or use mixture
- ½ unit red pepper, chopped(optional)
- 1 tablespoon butter
- 1 tablespoon avocado oil
- 2 tablespoon butter
- 1 cup whole milk
- 2 tablespoon flour
- 1 teaspoon Dijon mustard
- cayenne pepper, pinch
- 8 ounce Parmesan Reggiano cheese or cheddar cheese, gratedaged cheddar1:1vegetarian
sharper flavor
Instructions
- 1
Heat oven to 400 degrees.
- 2
Heat butter and avocado oil in cast iron over medium heat. Once melted, add onion and saute until translucent.
- 3
Add chopped broccoli, mushrooms, garlic, and red pepper if using. Sprinkle with salt and pepper, saute until cooked through, then remove from heat.
- 4
In a small pan, melt butter over low heat. Add flour and whisk until combined.
- 5
Slowly drizzle in milk, whisking constantly, until sauce thickens.
- 6
Remove pan from heat and stir in Dijon mustard and one-third of grated cheese. Season generously with salt and pepper.
- 7
Add cooked rice to vegetable mixture and mix well. Pour cheese sauce over and gently mix to coat.
- 8
Sprinkle remaining cheese over top.
- 9
Bake for 10 to 15 minutes, until cheese has mostly melted. Run under broiler until cheese is golden on top.
Tips
Use a cast iron skillet for even heat distribution during the initial vegetable saute.
Whisk the cheese sauce constantly to prevent lumps when adding milk.
Watch the broiler carefully to avoid burning the cheese topping.
Good to Know
Cover and refrigerate up to 3 days. Reheat covered at 350F until warmed through.
Assemble casserole without baking up to 8 hours ahead. Bake before serving.
Serve hot directly from the baking dish.
Common Mistakes
Add milk too quickly to the roux to avoid lumpy sauce.
Do not over-broil to avoid burnt cheese.
Stir gently after adding sauce to avoid breaking up vegetables.
Substitutions
sharper flavor