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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:


Click HERE to save this casserole with green chiles to Pinterest


Print Recipe
5 from 11 votes

How to Make the 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 mins
Cook Time35 mins
0 mins
Total Time45 mins
Course: Side Dish
Cuisine: American
Keyword: summer squash casserole
Servings: 8
Calories: 451kcal
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: 451kcal | Carbohydrates: 71g | Protein: 14g | Fat: 17g | Saturated Fat: 10g | Cholesterol: 45mg | Sodium: 426mg | Potassium: 2054mg | Fiber: 12g | Sugar: 14g | Vitamin A: 60291IU | Vitamin C: 120mg | Calcium: 511mg | Iron: 4mg

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Recipe Rating


Sunday 29th of August 2021

This is the best dish with both zucchini and yellow quash. I fixed it as a side dish and it ended up being the main dish. Everyone loved it. Great dish.


Monday 30th of August 2021

That makes my heart happy. We are so glad you enjoyed it.

Nancy Bell

Saturday 31st of October 2020

So I saw the above comment about the amount of squash, my squash are all different sizes, so looking at your estimate of size the recipe would use 6-7 cups of squash? Thank you1.

Gay Uhland

Monday 7th of September 2020

Pueblo Poblano peppers I roasted along with zucchini - didn't have any yellow squash at the moment. It was so so good!


Wednesday 9th of September 2020

That sounds great also. Thank you for letting us know you enjoyed this recipe.

Gay Uhland

Saturday 5th of September 2020

I used poblano peppers ant it turned out so so good! A nice change from sautéed squash or other squash side dishes!

Mignon Sims

Sunday 9th of August 2020

My husband & I are New Mexican and have been have been for the past 55 years.. This is a great dish, and we will make again with a few adjustments.. First 3 green chilies are no where near enough .. second, we will use yellow onion not white( although you don’t specify) and 3rd we will use bread crumbs to thicken in the casserole itself but use panko seasoned as the topping, much crispier. I didn’t have enough parmesan so I did use a blend of parmesan and asiago cheese, not sure if it is a plus or minus.! Overall an excellent way to use summer yellow squash! We had supper tonight of both your yellow squash recipe and fried pattypan ( my first use) Thanks for sharing !!


Sunday 9th of August 2020

I lived in New Mexico for over 17 years and totally agree with you on adding more green chilies. HA! I did downsize it from my personal taste to accommodate those that don't sleep, eat and dream of green Chilies like us. Love that you made it your own. Thanks so much for your kind comments