Flathead Lake Monster Potatoes–an easy recipe for a small batch of homemade cheesy hashbrown potatoes in the Instant Pot or the slow cooker.

Flathead Lake Monster Potatoes
Today’s dish is an easy recipe for cheesy hashbrowns. You can use your Instant Pot or Crockpot to make these potatoes. This recipe is adapted from Flathead Lake Monster Potatoes in the the Best of the Best from the Plains Cookbook Cookbook. The title caught my eye because I’m from Montana and have heard of the Flathead Lake monster 😉 not sure what these potatoes have to do with the monster but they were good! Skyler especially loved these potatoes. They make a small-ish batch which is nice when you want cheesy potatoes but don’t want to make a humongous pan.
Ingredients/Substitution Ideas
- Butter
- Onion–yellow, white
- Flour–all purpose
- Milk–or cream
- Sour cream–full fat or low fat
- Kosher salt
- Poultry seasoning
- Black pepper
- Garlic powder
- Frozen hashbrowns
- Cheddar cheese–or colby
- Crispy fried onions
Steps
Turn Instant Pot to saute setting. When display says HOT add in the butter and let it melt. Add in the onion and saute for 4 minutes.

Sprinkle in the flour and whisk it in. Whisk in the milk until it thickens.

Stir in the sour cream, salt, poultry seasoning, pepper and garlic powder. Turn off Instant Pot.

Fold in the hashbrowns so they are coated with the sauce.

Sprinkle the cheese on top.

Cover Instant Pot and set it to the slow cooker setting on high for 90 minutes.

When time is up sprinkle the onions on top and serve.

Notes/Tips
- Serve as a side dish to ham, steak, chicken, pork chops, etc.
- I used my 3 quart Instant Pot*. You can also make this in a 6 or 8 quart pot.
- This recipes makes a small batch. If you’d like you can double the recipe to make 7-8 servings.
- Store leftovers in an airtight container* in the refrigerator for up to 5 days or in the freezer for up to 3 months.
- Other recipes you can make with crispy fried onions are cruncheroni casserole and Kathy’s country chicken casserole.

Did you know you can filter the recipes on my website to search by meat type, IP or Crockpot, low carb, gluten free, etc.? Use the filter to find exactly what you are looking for.


Flathead Lake Monster Potatoes
- Prep Time: 20 minutes
- Total Time: 20 minutes
- Yield: 4 servings 1x
Description
An easy recipe for a small batch of homemade cheesy hashbrown potatoes in the Instant Pot or the slow cooker.
Ingredients
- 1 Tbsp butter
- 1/4 cup diced onion
- 1 Tbsp flour
- 1/3 cup milk
- 1/2 cup sour cream
- 1 tsp kosher salt
- 1/4 tsp poultry seasoning
- 1/4 tsp black pepper
- 1/4 tsp garlic powder
- 12 ounces frozen hashbrowns
- 1/3 cup shredded cheese
- 1/3 cup crispy fried onions
Instructions
Instant Pot Instructions:
- Turn Instant Pot to saute setting. When display says HOT add in the butter and let it melt. Add in the onion and saute for 4 minutes.
- Sprinkle in the flour and whisk it in. Whisk in the milk until it thickens.
- Stir in the sour cream, salt, poultry seasoning, pepper and garlic powder. Turn off Instant Pot.
- Fold in the hashbrowns so they are coated with the sauce.
- Sprinkle the cheese on top.
- Cover Instant Pot and set it to the slow cooker setting on high for 90 minutes.
- When time is up sprinkle the onions on top and serve.
Slow Cooker Instructions:
- Heat a pan over medium high heat. Add in the butter and let it melt. Add in the onion and saute for 4 minutes.
- Sprinkle in the flour and whisk it in. Whisk in the milk until it thickens.
- Stir in the sour cream, salt, poultry seasoning, pepper and garlic powder.
- Fold in the hashbrowns so they are coated with the sauce. Transfer to the slow cooker.
- Sprinkle the cheese on top.
- Cover and cook on low for 90 minutes.
- When time is up sprinkle the onions on top and serve.
- Category: Side
- Method: Instant Pot or Slow Cooker

More Instant Pot Sides…
Four Rivers Casserole
Mashed sweet potatoes topped with pecans. This is an easy and fast way to make sweet potato casserole using your Instant Pot.
Rocky Mountain Potatoes
It’s like a baked potato crossed with a mashed potato and you can make a single serving or you can make them for your whole family. An easy Instant Pot recipe!
*Karen Petersen is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.




The Crock Pot instructions start out heating in a pan – but does not ever progress to the Crock Pot ? ? ?
Oops sorry. I’ve corrected the recipe.
Is that correct that it is cooked in the Instant pot for 90 minutes
And the crockpot 90 minutes?J
Crock pot setting on your instant pot for 90 minutes
It’s cooked on the slow cooker setting in the instant pot.