This Onion Mashed Potato Casserole is tacky, filled with onion taste, and assured to be successful with the entire household!
You can also make it with recent potatoes for that home made contact, or use boxed mashed potatoes in case you’re quick on time. Both approach, it’s cozy, scrumptious, and goes completely together with your favourite weeknight mains.
It’s one in every of my go-to 5-ingredient casseroles—simply 20 minutes of prep and it’s within the oven, filling the kitchen with the very best savory aroma.

A fast heads-up: the Lipton onion combine turns the potatoes a tan-brown shade, so they might not look appetizing earlier than baking. However as soon as that cheese will get bubbly and golden on prime, it’s irresistible. My boys had been hesitant at first, however as soon as they tried it, they had been hooked!
We particularly like it with Saucy Parmesan Hen, because the flavors complement one another completely!
Now, let’s dive extra into why this household dinner favourite belongs in your desk!
Why You’ll Love Onion Mashed Potato Casserole
This simple onion potato casserole is ideal for busy weeknights! With just a bit boiling, mashing, and baking, you’ll have a comfy aspect dish prepared very quickly.
- Tremendous easy — Solely 5 substances and no fancy steps
- Child authorised — Even choosy eaters can’t say no to that tacky prime
- Nice for prepping forward — Put it collectively earlier and bake whenever you’re prepared
- At all times successful — Works for household dinners or when it’s essential to deliver a dish to share
- Price range-friendly — Made with inexpensive staples you most likely have already got
You possibly can double the recipe for bigger gatherings or customise it with various kinds of cheese. Some households like including a spoonful of bitter cream for further creaminess, whereas others sprinkle bacon on prime for a savory crunch.
That is a kind of recipes you’ll end up coming again to time and again!
This put up comprises affiliate hyperlinks, which implies I earn a fee when something is purchased. That is at no extra price to you.
🍳 My New Favourite — With a Reader Low cost!
That is my new favourite nonstick skillet I exploit each single week — and I’ve bought a deal only for you!

🛍️ Elite 5.5-Quart Oval Electrical Skillet
- ✔️ Non-toxic & PFAS-free
- ✔️ Simple to wash (even after tacky eggs!)
- ✔️ Lovely sufficient to serve in
🌿 $25 off a $150+ buy with code: 3BOYSANDADOG
🟢 “400+ readers clicked this code final month – I actually love this pan!”
Substances for Tacky Onion Potato Bake
This recipe is refreshingly easy, with simply 5 principal substances that come collectively to create the right consolation meals expertise we’re after.
Right here’s what goes into your simple weeknight sides masterpiece:
- Medium Potatoes — The star of the present, offering that creamy base all of us love
- Lipton Onion Soup Combine — Brings tons of savory taste with none further chopping or prep
- Milk — Helps create that easy, creamy texture that makes this so irresistible
- Butter or Margarine — Provides richness and helps all the pieces meld collectively completely
- Shredded Cheddar Cheese — As a result of what’s a casserole with out melted cheese on prime?
Able to get cooking? A printable recipe card is accessible on the backside of this put up, containing all the precise measurements you’ll want.
Directions to Make Simple Onion Potato Casserole
Making this vacation aspect dish favourite couldn’t be simpler! Your entire course of takes roughly 40 minutes from begin to end, with most of that point spent on hands-off baking. Right here’s learn how to create it step-by-step:
- Preheat the oven to 350°F so it’s prepared whenever you add your casserole.
- Prep the potatoes — peel and lower them into roughly 1-inch chunks, protecting them uniform in order that they cook dinner evenly.
- Boil the potatoes in a big pot of salted water for about 10 minutes, till fork-tender however not falling aside.
- Drain effectively. No one needs watery mashed potatoes!
- Mash the potatoes with the onion soup combine, milk, and butter till easy and creamy.
- Switch the combination to a greased casserole dish and unfold it evenly.
- Prime with shredded cheddar cheese — be beneficiant for that tacky consolation issue!
- Bake for about 20 minutes or till the cheese is melted and evenly golden.

Facet Dish Ideas and Methods
Listed below are some insider tricks to take your creamy onion potato aspect dish to the subsequent degree!
- Grease the dish effectively. Use cooking spray or butter to maintain the potatoes from sticking. This manner, you’ll hold all these golden, tacky edges intact.
- Make it forward. Assemble all the pieces besides the cheese topping, cowl, and refrigerate for as much as 24 hours. When able to bake, let it sit at room temp for half-hour, add the cheese, and bake!
- Increase the creaminess. Swap milk for half-and-half or stir in a bit of cream cheese for an extra-rich, indulgent casserole.
Troubleshooting Baked Mashed Potato Casserole with Onions
Typically issues don’t go precisely as deliberate, however these fixes will save the day!
- Too thick? Add a splash of milk till it’s good. Keep in mind, it’s going to agency up barely because it bakes, so don’t fear if it appears considerably unfastened whenever you put it within the oven.
- Too salty? Use low-sodium soup combine subsequent time or add further milk. Pairing it with milder dishes also can assist stability flavors.
- Cheese browning too quick? Tent the highest with foil for the previous couple of minutes to maintain it bubbly, not burnt.
Really helpful Assets
Having the precise instruments makes making ready this Lipton onion soup combine recipe a lot simpler! Listed below are my go-to kitchen necessities that’ll assist you to create the right creamy onion potato aspect dish each time.
- A potato masher (will get your potatoes to only the precise consistency for that good creamy texture)
- A big mixing bowl set (for mashing potatoes and mixing all of your substances with out making a large number)
- A glass casserole dish (even warmth distribution means completely baked casseroles each single time)
Customizing this Facet Dish Recipe for Each Food regimen
This make-ahead potato dish is already fairly accommodating, however listed here are some easy swaps to make it work for various dietary wants!
- Dairy-Free Model – Use plant-based milk and butter alternate options, plus dairy-free cheese shreds. The feel stays creamy and scrumptious.
- Lighter Choice – Strive utilizing Greek yogurt instead of a number of the butter, and scale back the cheese by half.
- Further Indulgent – Add cream cheese to the mash for ultra-rich outcomes that’ll have everybody asking for the recipe.
- Gluten-Free – Excellent news! This recipe is of course gluten-free whenever you use common potatoes and examine that your soup combine doesn’t comprise gluten components.

Making a Meal Out of Creamy Onion Potato Facet Dish
Whereas this casserole shines as a aspect dish, you may construct a whole meal round it! The wealthy, creamy flavors pair superbly with a variety of principal dishes and recent sides.
In the event you’re feeding a crowd, contemplate establishing a potato bar! Make a giant batch of this casserole and let individuals add their very own toppings, akin to bacon bits, chives, or further cheese, to customise their dish.
It’s interactive and enjoyable for events or household gatherings.
Store My Printables
These printables are nice for meal planning and organizing! Merely click on the picture to take a look at my store merchandise!



Recipes with Potatoes
Love cooking with potatoes? Potatoes are such a dependable base for consolation meals that feeds the entire household.
Listed below are extra scrumptious methods to place this versatile ingredient to work in your kitchen!

FAQs about Onion Mashed Potato Casserole
Onion Mashed Potato Casserole Storage and Reheating Ideas
Leftovers will hold effectively within the fridge for about 3–4 days. You possibly can cowl the entire dish or portion it into hermetic containers for fast grab-and-go servings.
To reheat, heat single parts within the microwave for about 1 minute, or place your complete dish in a 325°F oven till scorching. If the bacon and cheese begin to crisp up an excessive amount of, loosely cowl them with foil. For greater parts, stir in a splash of milk earlier than reheating to maintain the potatoes creamy.
This casserole may be frozen for as much as 2–3 months, although the bitter cream could separate barely after thawing.
Received leftovers? Flip them into one thing new! Spoon them over a baked potato with further toppings, use them as a creamy layer for shepherd’s pie, or combine them right into a hearty breakfast hash.

Onion Mashed Potato Casserole
Onion Mashed Potato Casserole is a recipe of tacky, onion, goodness that everybody is bound to like!
- 8 medium potatoes peeled lower into 1 inch chunks and boiled for approx 10 minutes.
- 1 envelope Lipton Onion soup combine
- ½ Cup(s) milk I exploit 2%
- ½ stick butter or margarine I exploit Nation Crock with calcium
- ½ – Cup(s) shredded cheddar
Serving: 1gEnergy: 110kcalCarbohydrates: 25gProtein: 3gFats: 0.2gSaturated Fats: 0.1gPolyunsaturated Fats: 0.1gMonounsaturated Fats: 0.01gTrans Fats: 0.002gLdl cholesterol: 0.1mgSodium: 16mgPotassium: 599mgFiber: 3gSugar: 1gVitamin A: 4IUVitamin C: 28mgCalcium: 18mgIron: 1mg
Extra Recipes Like Simple Onion Potato Casserole
If this household dinner favourite hits the spot, you’ll love these different consolation meals classics which are simply as simple to make!
- Corn Pudding — A candy and savory corn dish baked right into a custardy aspect dish. This Southern favourite enhances barbecue and roasted meats superbly.
- Broccoli Rice Casserole — Creamy, tacky, and loaded with tender broccoli. This veggie-packed aspect pairs completely with grilled hen or beef.
- Inexperienced Bean Casserole — The traditional vacation favourite that works year-round. Tender inexperienced beans in creamy mushroom sauce topped with crispy onions.
Prepared to provide these recipes a strive? Strive the Onion Mashed Potato Casserole first. I’d love to listen to the way it seems for your loved ones! Drop a remark under and let me know in case you added any particular touches.

Don’t overlook to avoid wasting this recipe for these busy weeknights whenever you want one thing dependable and scrumptious. Your loved ones goes to like this creamy, tacky consolation meals!
And in case you’re on the lookout for less difficult dinner concepts, make sure you browse our different fast and scrumptious household favorites. Blissful cooking!
Onion Mashed Potato Casserole is a recipe of tacky, onion, goodness that everybody is bound to like! This may be made with actual potatoes or you may alter the recipe a bit to make use of boxed mashed potatoes as an alternative. Both approach, it’s a scrumptious and filling aspect dish that’s good for any meal. That is one in every of my favourite simple casserole recipes!