Our Supreme Mashed Potato Casserole is truly amazing! It starts with sour cream, butter and cheese. Add fantastic ingredients like, bacon, crispy fried onions, Ranch dressing and more and you end up with a truly magnificent potato casserole!
The Best Mashed Potato Casserole
Potatoes are one of my favorite things to eat in this world and I wish I could eat them every day, in one form or another! Although that is extremely unrealistic I can dream can’t I?
That being said, this is my favorite mashed potato casserole in the world! I use this recipe all the time and have for years. Sometimes I switch up what I include in it but for the most part I always make it basically the same way.
For example, I don’t always add the ranch seasoning. I will sometimes add ¼ cup of ranch dressing and reduce the amount of milk to ¼ cup or I skip the ranch flavoring altogether.
Most often, I decide what I am including in this casserole based on the ingredients I already have, what we are serving with it and what I am in the mood for!
The amount and type of cheese you use is totally optional. I have listed approximate amounts as a guide. I hope that while you are blending your mashed potatoes together you will grab a handful of spoons and taste it as you go. That is exactly what I do.
On many occasions I have just used cheddar because that is all I had and frankly I love cheddar cheese and the casserole still was fantastic. Frequently I will add more cheese on top as well. Experiment and keep tasting as you are adding everything.
Bacon is totally optional. When I am in the mood I cook between 6 and 10 slices, in the microwave, oven or skillet and crumble or dice it up. I always save some for the top as well. I think it just looks terrific and tastes pretty terrific too!
I LOVE using flavored sour cream dips and that is the secret ingredient that makes this casserole taste even better. While you are at your local grocery store have a look at all of the sour cream dip flavors that exist.
Maybe it’s your favorite chip or veggie dip? I have a french onion dip that I just love using and my son prefers this jalapeno cheddar dip. Most flavors will work beautifully with potatoes!
The only thing you have to be sure of is that it is sour cream based and you enjoy the flavor! I can’t wait to hear which dip you chose and what you thought of it! There are just so many flavors to try!
The truth is you can put in as much or as little of anything and everything until the mashed potatoes taste the way you want them to. Remember to taste as you go. This recipe is awesome!
Ingredients in Supreme Mashed Potato Casserole
- russet potatoes
- butter
- milk
- sour cream or sour cream-based dip
- shredded cheddar and Monterey Jack cheeses
- garlic salt
- pepper
Options
- chives or green onions
- ranch seasoning or ranch dressing
- bacon or bacon bits
- crispy fried onions
- Parmesan cheese
- green chiles
How to make a Supreme Mashed Potato Casserole
Peel and chop potatoes, then boil until soft, about 15-20 minutes.
Mash potatoes in a large bowl, then mix with butter, milk, sour cream, ranch, cheese, garlic, and pepper.
Spray a casserole dish with nonstick (I use a 10-inch dish), and press potatoes into it.
Cover with ¼ cup cheese.
Bake at 400 for 25-30 minutes until top is a golden brown.
Top with chives, bacon, and other extras and serve as desired.
Can you prepare this ahead of time?
Yes this Supreme Mashed Potato Casserole can be made ahead of time! Prepare the casserole according to directions and stop before you add the toppings all over the top of it.
Remove the casserole from your fridge and allow it to rest at room temperature for about 30 minutes before baking.
After the 30 minutes or so sprinkle all of the toppings on the casserole right before you are ready for it to go in the oven.
I usually include bacon inside this mashed potato casserole and will save some to sprinkle on top too.
Next, I add crispy fried onions because they were created for this casserole! ?
I am also a huge parmesan cheese fan so I will sprinkle some all over right before I add the shredded cheddar and monterey jack cheeses!
There you have it, the top is finished and you are ready to bake!
Preheat your oven to 350 degrees and then bake for about 50 minutes. I also broil for a few minutes at the end just to brown the top.
Other Great Potato Recipes
Slow Cooker Bacon Breakfast Potatoes
Potato, Onion, Carrot and Green Bean Casserole
Oven Roasted Carrots and Potatoes
Slow Cooker Scalloped Alfredo Potatoes and Cauliflower
Marcel’s Easy Cheesy Potato Casserole
Cheesy Ranch Twice Baked Potato Boats
Little Alfredo Bacon and Cheese Potatoes
Awesome Cheesy Twice Baked Potato Boats
Fully Loaded Hasselback Potatoes
Cheesy Baked Bacon Ranch Little Potatoes
Supreme Mashed Potato Casserole
Supreme Mashed Potato Casserole Video
Supreme Mashed Potato Casserole Video
Supreme Mashed Potato Casserole
Equipment
- saucepan
- casserole dish (8-10 inches long by 6-8 inches wide or equivalent)
Ingredients
- 8-10 russet potatoes
- 2 tablespoons butter
- ⅓ cup milk
- ½ cup sour cream or sour cream based flavored dip
- 2 ¾ cups cheddar and monterey jack cheeses, shredded, divided
- 1 teaspoon garlic salt
- ½ teaspoon pepper
Options
- 2 tablespoons ranch seasoning (or ¼ cup ranch dressing and only ¼ cup of milk)
- chives or green onions
- ¼ cup parmesan cheese (optional)
- bacon or bacon bits
- green chiles, diced
- crispy fried onions
Instructions
- Preheat your oven to 400 degrees.
- Peel and chop potatoes, then boil in salted water until soft, about 15-20 minutes. Drain and return to pot or a large bowl.
- Ideally, using a handheld mixer, add butter to your potatoes. I add butter first while the potatoes are hot so the butter melts easily.
- Add milk, sour cream, ranch (if using), cheese, garlic salt, pepper and any other option you want to include. Blend ingredients together. TASTE your potatoes and add more of whatever you think they need, if anything at all.
- Spray a casserole dish with cooking spray and press your potatoes into it. Try and make the top as even as possible.
- First, I sprinkle bacon all over the top (if using), then crispy fried onions, and parmesan cheese (if using). Last, I sprinkle between ½ – 1 cup of shredded cheddar and monterey jack cheeses all over the top. Sometimes a little more, sometimes a little less.
- Bake for 25-30 minutes until top is a golden brown. Sometimes I will broil for a minute or two to darken the cheese a little more, if needed.
- Top with chives or green onions. Serve as desired.
Berta
My family love this casserole and it is a part of our rotation. Thank you for sharing it. Your recipes are amazing.
Karin and Ken
As always you’re most welcome! We love this casserole too! I’m so happy to have you with me on my food journey. I will continue to do my best! Enjoy your day! Karin
Tanya
Great casserole Didn’t include ranch because I didn’t have any but everything else was exactly the way we like it Crispy onions are great idea with the chip dip. Thank you i will be making this again You have good recipes
Karin and Ken
I’m happy to hear that you are enjoying our recipes! The crispy onions and sour cream based dip make the casserole amazing in my opinion! Thank you for taking the time to comment! You made my day! All the best. Karin
Candace
Best mashed potato casserole I skipped the ranch but the sour cream dip was amazing Such great flavour added and I can’t wait to try another dip next time THANK YOU
Karin and Ken
You are most welcome. Perhaps next time you can try it with the ranch if you decide to try it! Glad to hear you enjoyed it! I love this casserole and am glad we are not the only people who do! All the best. Karin