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Mushroom Polenta Casserole

Mushroom casserole with a sauce that is delightfully garlicky. I made three slightly different variations to see what flavors worked best together. Here’s the finalized result of trial and error. Images are of all three batches.


The three layers of the casserole

This is a three layer casserole that can be made in about an hour and a half.


  • Half a head of cauliflower
  • 1 large yellow onion
  • 8 oz of portabella mushrooms
  • 1 cup grits
  • 3 cups water divided
  • 1/2 tsp salt divided
  • 1 1/2 tsp garlic powder divided
  • 3 tsp dried rosemary
  • Head of fresh garlic
  • 1 cup raw cashews
  • 6 Tbsp nutritional yeast
  • 1 1/2 tsp dried sage
  • 1/2 tsp dried tarragon


  1. Preheat the oven to 350 degrees. Meanwhile, roughly chop half a head of cauliflower.
  2. Place chopped pieces onto a baking sheet and place in oven to cook for 30  minutes, flipping halfway through.
  3. Chop onion and mushroom and set aside
  4. Finely chop garlic and set aside
  5. Bring large skillet to medium heat and then add onions. Cook for 4 minutes until translucent, stirring occasionally
  6. Add mushrooms to the onions and continue to cook for another 5 minutes. Remove from heat and set aside
  7. In the empty skillet add the garlic and sauté on medium low heat for 1-2 minutes
  8. Bring 2 cups water to a boil in a saucepan. When boiling add the grits, 2 tsp rosemary, 1 tsp garlic powder, and 1/4 tsp salt. Reduce heat to low and cook covered for 5 minutes. Set aside
  9. When cauliflower is done, remove and place pieces into blender with 1 cup water, sautéed garlic, sage, tarragon, 1/4 tsp salt, 1/2 tsp garlic powder, 1 tsp rosemary, and cashews. Blend together until smooth (about 1 minute)
  10. Layer the polenta into 3-5″x5″ casserole dishes or one 9″x9″ dish
  11. Next, layer the onion and mushroom
  12. Follow that with the blended cauliflower topping
  13. Once all the layers are added, place into the oven for 45 minutes at 350 degrees for the smaller 5×5 dishes or for 60 minutes for 9×9 dish

Final result!

This entry was posted in: Dinner


My name is Savannah, and I am someone who is in love with trying new foods, sharing herbal knowledge, and getting outdoors. Thanks for joining me on my blogging adventure.

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