Creamy Baked Mushroom Rice Casserole Recipe

Everything below is important, so please read and enjoy the pictures—but don’t skip the details. This recipe is my newest obsession: a creamy, indulgent baked brown rice that tastes shockingly like risotto. If you think brown rice is always a little grainy and definitely “healthy,” be prepared to change your mind. Slow-baked with rich flavors, this brown rice becomes silky, luscious, and utterly comforting.

The texture here is the surprise: you’ll swear you’re eating classic risotto, yet this is made with brown rice. The result is rich, creamy, and deeply satisfying. I’m honestly obsessed. While this version includes mushrooms, they’re optional—add a protein or another vegetable, or serve the rice on its own. The rice is the star.

The base starts with sautéed onions, garlic, and fresh thyme in olive oil. A splash of sherry deglazes the pot and adds a subtle complexity. Once the rice is added and combined with beef stock, the pot goes into a low oven (325°F) to bake for an hour. That slow bake is where the rice softens and releases starches that create the risotto-like creaminess.

When the rice finishes baking, stir in Parmesan, heavy cream, and a little reserved beef stock. Stir vigorously for a couple of minutes so the starches, cheese, and cream meld into a silky sauce. Add the sautéed mushrooms at the end and season to taste. The final dish is rich, comforting, and surprisingly luxurious for a whole-grain rice.

If you dislike mushrooms, don’t worry—the mushrooms are cooked separately and stirred in at the end, so you can skip them or swap in something you prefer. This rice is versatile, keeps well, and is perfect as a side or a main.

Quick trip update: I was away in Charlotte, NC for a spring break visit. I meant to post before I left but parent‑teacher conferences took up the final day and delayed this share. Aside from a brief scare when the baby’s movements slowed (all turned out fine after a hospital check), the trip was restful and lovely—complete with quality time with friends and family.

This rice really is life. It’s cozy, rich, and the kind of comfort food you’ll want again and again.

Creamy Baked Mushroom Rice

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4.5 from 2 reviews

  • Author: Annie Chesson
  • Prep Time: 15 mins
  • Cook Time: 1 hour
  • Total Time: 1 hour 15 mins
  • Yield: 7 servings

Ingredients

  • 2 cloves garlic, minced
  • 1 onion, diced
  • 1/2 teaspoon fresh thyme, finely chopped
  • 1/4 cup sherry
  • 2 cups brown rice
  • 6 cups beef stock, divided
  • 1/2 cup heavy cream
  • 1 cup Parmesan cheese, grated
  • For the mushrooms:
  • 4 cups sliced baby portobello mushrooms (or your preferred mushrooms)
  • 2 tablespoons butter
  • 2 tablespoons olive oil
  • 2 cloves garlic, crushed
  • A few sprigs fresh thyme

Instructions

  1. Preheat the oven to 325°F (165°C).
  2. In a large Dutch oven or heavy-bottomed pot, heat a bit of olive oil over medium heat.
  3. Add the diced onion, minced garlic, and chopped thyme. Season with salt and pepper.
  4. Sauté, stirring often, until the onions are softened.
  5. Deglaze the pan with the sherry and cook until most of the liquid has been absorbed.
  6. Add the brown rice and stir to coat.
  7. Pour in 5 1/2 cups of the beef stock, reserving 1/2 cup for later.
  8. Adjust seasoning with salt and pepper.
  9. Bring the mixture to a boil on the stovetop.
  10. Once boiling, turn off the heat, secure the lid on the pot, and transfer the pot to the preheated oven.
  11. Bake for 1 hour.
  12. About 20 minutes before the rice finishes, prepare the mushrooms.
  13. In a large skillet, melt the butter with the olive oil. Add thyme sprigs and crushed garlic.
  14. When the butter has melted, add the sliced mushrooms and stir to combine.
  15. Cook over medium–medium-high heat until the mushrooms have softened and browned to your liking.
  16. Remove and discard the garlic cloves and thyme sprigs, season the mushrooms with salt and pepper, then set aside.
  17. When the rice is done, remove the pot from the oven, take off the lid, and stir in the heavy cream, reserved beef stock, and grated Parmesan.
  18. Stir for about two minutes so the rice releases starches and everything becomes creamy.
  19. Fold in the sautéed mushrooms, taste, and adjust seasoning with salt and pepper before serving.

Did you make this recipe?

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Recipe inspired by: Easy Brown Rice Risotto with Mushrooms and Fresh Oregano by Cookie and Kate.

Nutrition information is for 1-cup servings of the baked mushroom rice.

If you make this or any of my other recipes, tag it on Instagram with #thegarlicdiaries — I love seeing your photos!

In the mood for more healthy comfort food? Try these: Crock Pot Moroccan Lentil Soup, Skinny Pumpkin Alfredo, or Roasted Tomato Soup.