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cheesy potato mushroom casserole

(2 ratings)
Blue Ribbon Recipe by
Myra Lawrence
Las Vegas, NV

My BFF made this casserole for me and I loved it so much that she gave me the recipe. She passed away two months later. I miss her so much! I thought I would share this recipe in her memory. It is delicious with steak or ham.

Blue Ribbon Recipe

This potato casserole is similar to au gratin potatoes, with the addition of hearty mushrooms and onions. If you can't tolerate dairy, this recipe may not be for you because it's super cheesy. It uses Italian-style shredded cheese, Swiss cheese, and whipping cream. Once baked, this cheesy potato mushroom casserole is rich and creamy. A delicious and decadent side dish.

— The Test Kitchen @kitchencrew
(2 ratings)
yield 6 - 8 or me LOL
prep time 30 Min
cook time 1 Hr 35 Min
method Bake

Ingredients For cheesy potato mushroom casserole

  • 3 - 4 lg
    Idaho potatoes, peeled and thinly sliced
  • 1 tsp
    minced garlic
  • 1 stick
  • 1 lb
    mushrooms, any kind you prefer
  • 4 slice
    deli Swiss cheese
  • 1 1/2 c
    shredded Italian-style cheese
  • 1/2 lg
    onion, diced
  • 1 pt
    whipping cream
  • salt and pepper, to taste

How To Make cheesy potato mushroom casserole

Test Kitchen Tips
We cut the onions into slices and added them to the baking dish. Then we realized they should have been diced. In case you also make that mistake, it still works.
  • A layer of potatoes, seasoning, onion, and garlic in a baking dish.
    Preheat oven to 375 degrees. Grease a 9 X 13 baking pan with cooking spray on the bottom. Cover the bottom of the pan with a layer of potatoes. Sprinkle salt and pepper, along with some of the minced garlic and onion.
  • Half the mushrooms added to the baking dish.
    Add half of the mushrooms.
  • Pats of butter and Swiss cheese added to the dish.
    Add pats of butter and then layer slices of Swiss cheese.
  • Layers repeated adding shredded Italian cheese.
    Do another layer but use shredded cheese, the last layer should be the remainder of the potatoes and cheese.
  • Whipping cream poured into the baking dish.
    Pour the pint of whipping cream over the top.
  • Cheesy Potato Mushroom Casserole baking.
    Bake for 1 hour and then check the potatoes with a sharp knife to check to see if potatoes are cooked through. If not, bake for another 1/2 hour (depending on oven).
  • Baked Cheesy Potato Mushroom Casserole resting.
    Remove from oven, casserole will be bubbling and cheesy. I always let it sit for 10 minutes or so to let it set and cool a bit. I hope that you enjoy it!

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