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Best Squash Casserole with Green Chiles

We are pulling out all our Summer Squash Recipes so we can make the most of our garden right now.  One of our favorites is this Squash Casserole with Green Chile.

Summer Squash Recipe


We have yellow squash coming out of our ears right now from our garden.   And this Squash Casserole with Green Chile is our all-time favorite of all our summer squash recipes.    It has the perfect balance of flavor and is one great way to make the most out of our fresh yellow squash.

casserole with squash and  Green Chiles


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This amazing Squash casserole is loaded with cheeses and green chile.  And it’s topped with a breadcrumb parmesan cheese crumble.   It’s out of this world delicious.  Even some of your picky eaters might ask for a second helping of this Squash Casserole. 

Summer Squash and onions


Start off by thinly slicing 6 medium yellow squash and 1 large yellow onion.   Heat butter in a large skillet or wok and saute the yellow squash and the onion slices until the onions are translucent.

Add the cooked squash and onions into a large mixing bowl.  Then add the green chiles, cheeses, sour cream, salt, and pepper.    Gently mix until well combined and pour into a  2-quart baking dish that’s been lightly oiled. 
baked green chiles and squash


Mix the Parmesan cheese, breadcrumbs, and 1 tbsp melted butter in a small dish.    Then sprinkle the crumb mixture on top of this casserole.

Bake, uncovered for 20 minutes until the topping is golden.   Remove from oven and allow to cool for 5-10 minutes prior to serving.     Garnish with chopped parsley if desired.
 baked squash and green chile


We are thinking about making a few of these squash casseroles and freezing them.    We love freezer meals and having a vegetable casserole in the freezer would be a treat this winter when the garden is gone.   A bubbling pan of summer squash would go well with our Thanksgiving Turkey or our Christmas Baked Ham with Pineapple Glaze.


Other Summer Squash Recipes:


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Print Recipe
4.77 from 26 votes

Best Squash Casserole with Green Chile-Summer Squash Recipes

Sliced yellow squash and onions baked in a cheesey sauce and topped with a parmesan bread topping.  
Prep Time10 minutes
Cook Time35 minutes
0 minutes
Total Time45 minutes
Course: Side Dish
Cuisine: American
Keyword: summer squash casserole
Servings: 8
Calories: 229kcal
Author: Evelyn


  • 6 medium squash thinly sliced
  • 1 large onion thinly sliced
  • 1/4 cup butter
  • 1/2 cup parmesan cheese grated
  • 1 cup sharp cheddar cheese shredded
  • 1/2 cup sour cream
  • 3 whole roasted green chile peeled and chopped
  • 1/4 tsp salt
  • 1/4 tsp black pepper
  • Fresh chopped parsley optional


  • 1/4 cup breadcrumbs
  • 1/4 cup parmesan cheese
  • 1 tbsp butter melted


  • Preheat oven to 350 degrees F
  • Melt butter in a large skillet or wok over medium heat
  • Add squash and onions, saute' until onions are translucent
  • Place cooked squash and onions in a large mixing bowl, add cheddar cheese, parmesan cheese, sour cream, green chiles, salt and pepper
  • Gently mix until well combine
  • Pour the ingredients into a lightly oiled 2-quart baking dish ( or it can be sprayed with a cooking spray)
  • Mix the breadcrumbs, parmesan cheese, and 1 tbsp melted butter in a small dish and sprinkle the crumb mixture on top of the casserole
  • Bake, uncovered for 20 minutes until golden
  • Remove from oven, let cool 5-10 minutes prior to serving.
  • Garnish with chopped fresh parsley


Calories: 229kcal | Carbohydrates: 10g | Protein: 10g | Fat: 18g | Saturated Fat: 11g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 1g | Cholesterol: 48mg | Sodium: 427mg | Potassium: 80mg | Fiber: 12g | Sugar: 4g | Vitamin A: 526IU | Vitamin C: 2mg | Calcium: 242mg | Iron: 4mg

Recipe Rating


Saturday 26th of August 2023

Could this casserole be made ahead &baked later?


Saturday 26th of August 2023

Yes it certainly could. In fact I have a couple of these casseroles in the freezer that I prepared when my garden was producing an abundance squash.


Friday 25th of August 2023

So good!! I did one can diced chilies, and roasted 2 poblanos and roasted the onion as well in my air fryer, per someone else's comment. Made Chicken tacos and black beans as well in case this wasn't a hit, (leftover chicken I had made so really simple) but neither my husband or I touch anything except for adding some black beans to this. I also doubled the breadcrumbs. I am still so uncomfortably full I ate so much!


Friday 25th of August 2023

So good to hear. This makes my heart happy! Love roasted peppers, all peppers.

Kim Medeiros

Thursday 3rd of August 2023

This was so good! Used diced canned green chilis. Everything else by the recipe. Yum!


Thursday 3rd of August 2023

Yay!! Soo happy you like it!


Thursday 20th of July 2023

My mouth is watering! Will make it tomorrow. Do you think using sautéed jalapeños could be substituted for the green chilies?


Saturday 22nd of July 2023

I bet Jalapeños would work if you like it a little more spicy. Sounds really good.


Thursday 2nd of March 2023

My family and I loved this recipe!! Delicious!!! Can't wait to make it again! Thank you for sharing this recipe!!


Thursday 2nd of March 2023

Awe Thanks. We are so glad you enjoyed it.