Asparagus Casserole

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Super creamy Asparagus Casserole with a french-fried onion topping.


A creamy and rich Asparagus Casserole with fresh asparagus and a crunchy fried onion topping is the perfect spring casserole and would be a great addition to your Easter menu.

In addition to fresh asparagus, this casserole has mushrooms, onion, sour cream, mayonnaise, and two kinds of cheese. How can it not be good?

Asparagus Casserole is super creamy with a french-fried onion topping.

No cream of anything soup is needed. Instead milk is added to a butter and flour roux.

Asparagus Casserole is super creamy with a french-fried onion topping.


The crunchy onion topping is my favorite. In addition to scattering them on top, I also like to crush some fried onions and mix them into the casserole. Not only do they provide flavor, but they act as a thickener as well.

Asparagus Casserole is super creamy with a french-fried onion topping.

As a time saver, Asparagus Casserole can be assembled a day in advance and baked just before serving.

It’s a rich and decadent spring casserole and there’s no better way to enjoy fresh asparagus.

Asparagus Casserole is super creamy with a french-fried onion topping.

Super creamy Asparagus Casserole with a french-fried onion topping.

Asparagus Casserole

Course: Side Dish
Prep Time: 20 minutes
Cook Time: 30 minutes
Total Time: 50 minutes
Servings: 8 servings
Calories: 368kcal
Author: Christin Mahrlig
Asparagus Casserole, made with fresh asparagus, is creamy and rich with a crunchy fried onion topping.
Print Recipe


  • 4 tablespoons (1/2 stick) butter
  • 2 1/2 pounds asparagus, trimmed and cut into 1-inch pieces
  • 1 (8-ounce) package white mushrooms, sliced
  • 1/2 medium sweet onion, chopped
  • 1/4 cup all-purpose flour
  • 1 1/4 cup milk
  • 1/2 cup mayonnaise
  • 1/2 cup sour cream
  • 1/2 cup shredded cheddar cheese
  • 1/2 cup shredded swiss cheese
  • 1/2 teaspoon salt
  • 1/2 teaspoon lemon pepper
  • 1/4 teaspoon paprika
  • 1 (6-ounce) can french-fried onions.


  • Grease a casserole dish and preheat oven to 350 degrees.
  • Melt butter in a large pan over medium heat. Add asparagus, mushrooms, and onions and cook, stirring occasionally, for about 6 minutes.
  • Sprinkle flour over vegetables and cook, stirring continuously, for 1 to 2 minutes.
  • Gradually stir in milk. Cook until thickened.
  • Reduce heat to low and mix in mayonnaise, sour cream, both cheeses, salt, lemon pepper, and paprika. Remove from heat.
  • Crush about 1/3 of the can of french-fried onions and mix them into the asparagus mixture.
  • Transfer mixture to prepared casserole dish.
  • Sprinkle remaining french-fried onions on top.
  • Place in oven and bake for 30 minutes.



Calories: 368kcal

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35 thoughts on “Asparagus Casserole

  1. Didn’t have the mushrooms or lemon pepper. So I juiced 1/2 a meyer lemon and zested it. SO YUMMY! This is a keeper recipe. Thank you!!!

  2. This tasted like green bean casserole but with asparagus. I really liked this but wasn’t crazy about the mushrooms in the recipe. Neither was my husband, but next time I make it I’ll leave them out. Then it will be perfect for our tastes. Thanks for sharing it!

  3. Loved this dish. I halved the recipe as I didn’t have enough asparagus for the full recipe. Also had to sub Italian blend for Swiss and black pepper for lemon pepper, added a little garlic powder too. Loved that it did not use the canned cream of whatever soup. Definitely a keeper, already printed…..thanks for sharing!

  4. Very good! I halved the recipe and substituted black pepper for the lemon pepper and Italian blend for the swiss as those items didn’t require a trip to the grocery. I also added a little garlic powder as we love it. I printed the recipe as it is definitely a keeper!

    Thanks for sharing!

  5. Used Greek yogurt instead of sour cream and heavy cream 1 cup instead of milk due to not having the ingredients. Turned out great! Planning to make fried onions and hope it goes well versus the store bought one.

  6. Loved this. Very tasty and easy to make. Will be one of our go to recipes. Definitely would serve for guests … if I want to share!!

  7. WOW! This is so delicious! I will be making this for Easter 2018 and I’m sure it will be the best dish at our family potluck!! Thank you so much for this recipe!!

  8. I am trying this recipe tonight. Instead of French fried onions which I do not have, I will used crushed bacon for crunch and yum. Forhe topping, I will used crushed Ritz crackers sprinkled with butter. Can’t wait! Thanks for the recipe!

  9. I have been making this for years , except I chop up boiled eggs and shredded cheddar cheese.use cream of mushroom soup salt pepper. (Kind of like green bean casserole) Top with sliced boiled eggs.. also add mushrooms. The eggs make it really creamy.

  10. I was looking for asparagus recipes and found your web site. I found 2 that sound awesome and asparagus is in season. My question is, have you ever tried freezing asparagus? If so, would you share?

    1. Not sure that you can freeze asparagus. From what others have told me, it thaws out mushy. Never tried it myself though and you can’t believe everything you hear! Albertsons had asparagus on sale for 1.49 a pound a week or so ago and I wanted to try it in the freezer. Next time I definitely will!

    2. Yes you can freeze asparagus. Blanch it for 2.5 minutes, then immediately cool it in ice water to stop it from cooking. Dry spears thoroughly with paper towels and spread them out on a cookie sheet. After freezing pack them in freezer bags before they begin thawing (vacuum packing is even better), and place in freezer immediately.

  11. I just saw this great looking recipe. I would probably add some water chestnuts to give it a little more crunch. I look forward to trying it.

  12. Yes indeed a really fine recipe and great alternative to that old nasty green bean casserole
    This is delicious , creative and most of all no cream of mushroom soup
    I love we get to make our own mushroom mixture
    Way to go Christin
    Thanks ,
    Dave and family

  13. This looks delicious! Going to make for Thanksgiving! Do you think I could prep the day before (do all stovetop cooking then refrigerate overnight) and bake right before serving?

  14. Delicious….I used a bit of blue cheese instead of swiss (didn’t have it). Also added a bit of pastrami I had in fridge for a little more protein…..Wonderful!!

  15. I love asparagus but my family, not so much! This along with all of your other recipes have my mouth watering. Thanks so much for linking up to Weekend Potluck. We hope you continue to drop off your amazing dishes with us each week.

  16. I can’t get enough of asparagus lately and I love the sound of it in this casserole! It looks fantastic with the crunch topping!

  17. We have eaten asparagus in like every form and fashion recently, except this one! I think I know what I will be ding next!! 🙂

  18. my rule is if i eat an 8 oz. steak i have to eat a green vegetable like steamed asparagus with mayonaise, no potato or bread–no carb. i’m trying high fat low carbs like uncured bacon and eggs every day but i don’t seem to be losing my belly fat from sweets like pastries which i’ve decreased 75% or so.
    fruit is like medicine and vegetables are like torture.

  19. Asparagus is looking so good right now and I’ve been loading up ! This casserole looks awesome. Love a bit of crunch from the asparagus and onion topping against the creaminess. Yum!

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