Zucchini, Squash & Corn Casserole – our favorite side dish! Zucchini, Squash, Corn, Onion, garlic, white cheddar cheese, sour cream, mayonnaise, eggs, breadcrumbs and parmesan cheese. Seriously THE BEST!!! Great make ahead side dish. Perfect for all your potlucks, cookouts and holiday meals!
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Pin This RecipeWe are obsessed with this delicious Zucchini, Squash & Corn Casserole. Fresh veggies and cheese are hard to beat! We’ve made this several times over the past month and it has been a hit every time. We really like it with grilled chicken and burgers.
This casserole can be made in advance and refrigerated overnight. I’ve even divided the casserole between two foil pans and frozen one for a quick side later.
This recipe uses “fresh breadcrumbs”. To make fresh breadcrumbs, just pop some bread slices in the food processor and pulse it a few times. I used homemade bread, but any type of bread will work just fine.
This casserole is going to be a staple in our house this spring and summer. This casserole is great for potlucks and cookouts. We are serving it this weekend with our Easter ham!
Zucchini Squash & Corn Casserole
Equipment:
Ingredients:
- 1½ lb yellow squash, thinly sliced
- 1½ lb zucchini, thinly sliced
- ¼ cup butter, divided
- 2 cups diced sweet onion
- 2 garlic cloves, minced
- 3 cups corn kernels
- 1½ cups shredded white cheddar cheese
- ½ cup sour cream
- ½ cup mayonnaise
- 2 eggs, lightly beaten
- 2 tsp pepper
- 1 tsp salt
- 1½ cups fresh breadcrumbs, divided
- 1 cup grated parmesan cheese, divided
Instructions:
- Preheat oven to 350ºF. Lightly spray a 9x13x2-inch pan with cooking spray.
- Melt 2 Tbsp of butter in large skillet over medium-high heat. Add zucchini, squash and onion. Sauté for 10 minutes, or until tender.
- Add garlic and cook and additional 2 minutes. Remove from heat.
- Stir together cooked zucchini, squash, onion, corn, white cheddar cheese, sour cream, mayonnaise, eggs, salt and pepper. Stir in ½ cup of breadcrumbs and ½ cup of parmesan cheese.
- Spread mixture into prepared pan.
- Melt remaining 2 Tbsp butter. Combine melted butter, remaining breadcrumbs and parmesan cheese. Sprinkle over casserole.
- Bake uncovered for 45 to 50 minutes.
Notes:
Steph
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Delicious! I used panko on top!
Made this for Father’s Day celebration last night. Everyone loved it including the kids. I did it exactly like the recipe and wouldn’t change a thing for next time!
Was good and easy enough to to make- simpler than making a rough. Also added some mushrooms and a bit of spinach all had on hand.
I use gluten-free breadcrumbs From a can. I also added two shredded chicken breast. This is what is for dinner. It was delicious. Next time I think I’ll add some jalapeños and mushrooms.
Sounds delicious!
This was excellent. Our squash is coming in fast, so I’m making a batch to freeze. Subbed Fage 0 for the sour cream and didn’t miss it. Added oregano from the garden. This will be a go to recipe from here on out. Great for entertaining, too!
Can I leave out the egg?
Unfortunately, without further recipe testing, I cannot answer with certainty. As always, please use your best judgment regarding substitutions and modifications.
Can this be made casserole be made in a crockpot?
Perfect as is ❤️
This dish never disappoints! I switch it up on occasion making it spicy as a tex-mex side, or emptying out the fridge of left over veggies from previous meals; this casserole is very forgiving! Great entertaining dish that can be made in advance (even the night before) refrigerated, then baked just before company arrives and its still wonderful. Thank you for sharing!
This recipe is awesome. I added shredded parmesan instead of grated parmesan. And used left over helluva good French onion dip instead of sour cream. It gave it more flavor. I also substituted fresh breadcrumbs with stove top stuffing. My family likes lots of seasonings. I used a bag of frozen corn and microwaved it for 4 minutes before adding it to the recipe. I have meat eaters in my home some I added about 1.5 cups of diced ham to the recipe or have used ground sausage in it as well. This recipe is just awesome and you can tweak it so many different ways. Glad I found this recipe
Hi, if using frozen corn, do I need to cook first? Or just throw them in frozen?
throw it in frozen
I used frozen corn too. I microwave it for 4 min first then drain off the fluid before I add it to the mixture. I would think adding it frozen would add more moisture
Made this casserole tonight for first time. We needed another veg to go with Christmas dinner leftovers. My daughter and both commented on how much they enjoyed it. I didn’t realize that I’d left the Mayo out until I read some of the comments asking for subs for it. It was great without the Mayo. Thanks for sharing your great recipe.
How far in advance could I make this? Would two days be too long?
I think 2 days would be fine
my family absolutely LOVED this recipe! I omitted mayo and added a little more sour cream. I also will change out the sour cream and mayo for plain greek yogurt to make it a little healthier in the future. thanks so much!!!!!