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Mushroom Potato Casserole Recipe

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★★★★★

4.5 from 139 reviews

This Mushroom Potato Casserole is a hearty, savory dish featuring tender mushrooms, beans, and sliced potatoes baked to golden perfection with a flavorful roasted garlic and herb topping. It combines a rich vegetable stew base with wholesome potatoes, perfect as a comforting main or side dish.

Ingredients

Scale

Vegetables & Aromatics

  • 10 to 12 ounces mushrooms, sliced ⅛” to ¼” thick
  • ¾ cup chopped onion, chopped small
  • ½ cup chopped carrots, chopped small (or more, to taste)
  • 1 bulb garlic
  • ¼ cup chopped celery
  • 3 or 4 medium russet potatoes, peeled and sliced ¼” thick

Oils & Seasonings

  • 3 teaspoons olive oil (divided)
  • ½ teaspoon salt
  • ½ teaspoon black pepper
  • 1 tablespoon soy sauce (or tamari or coconut aminos)
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • ¼ teaspoon salt (or more, to taste)
  • ½ teaspoon sage
  • ½ teaspoon oregano
  • 1 tablespoon fresh thyme (or ¾ teaspoon dried thyme)
  • 2 teaspoons lemon juice (or more, to taste)

Liquids & Other

  • ¼ cup red wine (or 1½ tablespoons balsamic vinegar + 2 tablespoons stock)
  • 15 ounce can white beans
  • 1½ cups stock (or more, if needed)
  • 2 teaspoons cornstarch (or flour)
  • 2 teaspoons tomato paste
  • 1 tablespoon softened vegan butter (or extra virgin olive oil)

Instructions

  1. Preheat and Prepare: Preheat your oven to 410°F (210°C) and grease a 10×13” baking dish. Chop all vegetables and slice the potatoes. Slice about one-third from the top of the garlic bulb to expose the cloves, reserving the small garlic pieces from the top third.
  2. Combine Initial Veggies: Place the reserved small garlic pieces along with mushrooms, onions, carrots, 2 teaspoons olive oil, salt, pepper, and red wine into the baking dish. Mix thoroughly to coat and spread evenly. Make space in the center and place the garlic bulb cut-side up, drizzle remaining olive oil over cloves. Cover loosely with parchment paper.
  3. Bake Vegetables: Bake for about 40 minutes until mushrooms are al dente and golden, onions translucent or golden. Stir at 30 minutes if needed to prevent scorching. Add extra stock if the dish appears dry.
  4. Add Seasonings and Base: Remove garlic bulb to cool. Add herbs (thyme, garlic powder, onion powder, sage), salt, tomato paste, and soy sauce to the dish. Mix well pressing out any tomato paste clumps. Stir in celery and white beans. Mix cornstarch (or flour) with stock and pour into dish. Stir to coat everything well and spread evenly. Layer sliced potatoes over the top, slightly overlapping.
  5. Prepare Garlic Butter: Squeeze roasted garlic from bulb into a bowl. Add vegan butter or olive oil, oregano, lemon juice, and a pinch of salt if using oil. Mash and mix until creamy. Spread dollops of this garlic butter over potatoes and smooth lightly. Reserve some for serving.
  6. Bake to Finish: Cover with parchment again and bake for 20 minutes. Remove parchment and bake for an additional 20 to 25 minutes until potatoes are tender and golden. Brush the top with reserved garlic butter. Optionally, sprinkle fresh herbs like parsley or basil before serving.
  7. Serve: Serve the mushroom potato casserole as a main dish or alongside a side salad, dinner rolls, or toasted sourdough for a complete comforting meal.

Notes

  • You can substitute balsamic vinegar and stock for the red wine if preferred or to keep it non-alcoholic.
  • Adjust carrot quantity according to taste; more carrots will add sweetness and bulk.
  • If the casserole dries out during baking, adding extra vegetable stock can keep it moist.
  • For best flavor, use fresh herbs when available but dried herbs work well too.
  • Roasted garlic butter adds rich flavor and creaminess but can be replaced with olive oil for vegan or lighter versions.
  • Make sure to slice potatoes evenly to ensure uniform cooking and tenderness.
  • This casserole reheats well and can be prepared ahead and baked later.

Keywords: mushroom casserole, potato casserole, vegan casserole, baked vegetable stew, roasted garlic recipe, hearty plant-based dish

Find it online: https://trendytasterecipes.com/mushroom-potato-casserole-recipe/