Zucchini, Squash & Corn Casserole

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!

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! #casserole #zucchini #squash #corn #sidedish #freezermeal

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We 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.

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! #casserole #zucchini #squash #corn #sidedish #freezermeal

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.

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! #casserole #zucchini #squash #corn #sidedish #freezermeal

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.

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! #casserole #zucchini #squash #corn #sidedish #freezermeal

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

Yield: 8 people
Prep Time 15 mins
Cook Time 45 mins
Total Time 1 hr
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! #casserole #zucchini #squash #corn #sidedish #freezermeal

Ingredients:

  • lb yellow squash, thinly sliced
  • lb zucchini, thinly sliced
  • ¼ cup butter, divided
  • 2 cups diced sweet onion
  • 2 garlic cloves, minced
  • 3 cups corn kernels
  • cups shredded white cheddar cheese
  • ½ cup sour cream
  • ½ cup mayonnaise
  • 2 eggs, lightly beaten
  • 2 tsp pepper
  • 1 tsp salt
  • 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 1/2 cup of breadcrumbs and 1/2 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:

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.
Can make the casserole in advance and refrigerate or freeze unbaked for later. To bake after freezing, thaw completely and bake as directed above.
Can omit breadcrumbs for a gluten-free recipe.
If you want a lower carb dish, swap the breadcrumbs for crushed pork rinds.

Steph

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scooping squash corn and zucchini casserole from baking dish
baking dish of squash corn and zucchini casserole
spoonful of squash corn and zucchini casserole
baking dish of squash corn and zucchini casserole

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Comments

  1. This is a keeper! We cook for about a dozen seniors each Friday. They loved it and so did we. We substituted cornbread stuffing for breadcrumbs and topped it with buttered crushed Townhouse crackers.

  2. This casserole is absolutely delicious. I did use store bought bread crumbs and will try with freshly made next time. Still was delicious.

        1. What a great idea! But unfortunately, without further recipe testing, I cannot answer with certainty. As always, please use your best judgment regarding substitutions and modifications.

  3. Best squash casserole I ever tasted! It's literally a meal in itself. I left out the parmesan b/c I don't like the taste. and used a Ritz cracker topping. The onion gave it a wonderful sweet taste. I wish there were an option to print it. I had to copy it down….not easy considering having to scroll through all those pesky ads!

  4. Lightly salt the slice squash/zucchini on top of paper towels to release excess liquid. Let set about 15 min. Then dab the excess salt/moisture of the top of squash with paper towels.

  5. This is a new favorite for an old lady. Been cooking and baking for over 50 years. Always looking for something new and yummy. I use light mayo and light sour cream and half the butter. Keep the tasty recipes coming. Thx much

  6. Do I need to dry the bread out first before putting in food processor? I want to make the fresh breadcrumbs. Thanks ! Doing it later today!

    1. I usually use a day old loaf of French bread. If the bread is super fresh, I might pop it in the oven for a few minutes to dry it out.

  7. What size pan do you recommend? Making it for Thanksgiving and don't want it to run over in my sister's oven ! Lol Thanks

  8. This was really tasty, but it made a TON of food. If I made this again I would only do a half batch because we just couldn't get through it all. Perfect if you're feeding a crowd.

  9. Made this a few nights ago and I LOVE it! I halved the recipe and it worked out just fine. I might add some ham chunks to make it a one-pan meal, or serve alongside ham. Might also try leaving out the corn and increasing the squash.

    Normally I do not eat leftovers (just one of several quirks) but am on my second day of them and finishing it up right now!

    Really delicious as is, thank you for posting!!

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