Last Updated on October 28, 2025 by Kymberley
Easy Summer Squash Casserole That’s Figure-Friendly Too!
Many people may think of cooler weather regarding casseroles, and this summer squash recipe is undoubtedly suited for making during those times. Still, cold weather aside, this dish has become one of our family favorites as a summer side dish, making it for cookouts, hearty dinners, and just about any other occasion where we’re feeding a crowd. Other big pluses are that it requires just a few minutes of prep time, only has a handful of ingredients, and it’s pretty figure-friendly too!
ABOUT THIS RECIPE (per serving)
What is Summer Squash Casserole?
Unlike many squash casseroles that are bathed in butter, cream, cheddar cheese, and mayonnaise, which often is among the ingredients of classic southern summer squash casseroles served at diners and church suppers in the south; this lower-calorie rendition focuses on a creamy béchamel comprised of butter and flour that has been cooked together (a mixture that’s also known as a roux) and milk, with just a bit of seasoning.
The sauce is then studded with fresh sweet corn creating a silky, creamy base for perfectly cooking the layers of tender squash as it clings to the crackers in the way a good sauce should – and it’s the roux we must thank for that.
Other than making the sauce, there’s not much more to prepare for the dish other than slicing the summer squash, crushing the crackers, and then layering it all together. To give the casserole maximum visual appeal, I especially like using a combination of yellow summer squash and green zucchini for the variety of beautiful colors in the finished dish. Because everyone knows we eat with our eyes first.
How to Make the Béchamel (White Sauce)
To make the roux for the béchamel, you heat the fat (in this case, the butter) and whisk in roughly equal parts of flour, simmering it just long enough to get the raw flavor out of the flour but not so long as the flour changes to a blonde or darker stage resulting in a nutty flavor. But that’s not what we want here.
After the roux is adequately cooked, the next step is to whisk in the milk. At this point, you may notice that this sauce is fat (butter), flour, and more fat (milk) – and that’s why it’s so darned good. But it’s the milk that turns the roux into the sauce. The trick is not to dump the milk into the roux at once. To create a velvety smooth consistency (a necessity in making béchamel), gradually whisk in the milk, so it doesn’t become clumpy or too thick. As a note, I’d like to mention that different recipes using béchamel will call for different amounts of milk and varied cooking times to produce a consistency from thick and almost spreadable to a medium thickness and nearly pourable as for this recipe.
Once you reach a medium thickness, it’s time to season the béchamel with the chicken broth base, salt, and white pepper; then stir in the sweet corn kernels, and that’s it!
Now, all you need to do is assemble the casserole.
Picture how to assemble it step-by-step...
Live Fully Nourished @GfreeDeliciously
Delicious, Gluten-Free, and Healthy Meet!
I promise not to spam you. Pinkie swear!
Make Southern Summer Squash Casserole in Advance
Assemble the Casserole in advance. Once everything is layered into your oven-safe baking dish, cover it tightly with plastic wrap or aluminum foil and refrigerate for up to 24 hours until ready to bake.
Before baking, let the casserole sit on the counter to warm to room temperature for at least 30 minutes before putting it in the oven. Please note that if the contents are still cold, you may need to extend the baking time by a few minutes until it becomes bubbly around the edges and the top is golden brown.
Got Loads of Zucchini & Summer Squash? Check out these great recipes!
Casserole Variations:
- Add a pinch or two of fresh herbs, such as basil, parsley, thyme, or oregano. Even freshly chopped chives would be a great addition to add another flavor layer!
- Instead of saltines, substitute gluten-free dry stuffing mix with melted butter for a flavorful topping (or use buttery club crackers or Ritz crackers – but only if you don’t need to be gluten-free). Other good options you might want to try might be gluten-free cornflakes or panko-style breadcrumbs.
- Use zucchini instead of summer squash, or try combining the two.
- Are you cooking for only a few? Adjust the recipe by changing the number of portions.
- We make it easy to adjust the serving size. CLICK HERE to learn how.
The béchamel makes all the difference in this casserole we were first introduced to at a summer potluck with friends outside Nashville. With one bite, our family (kids included) immediately fell in love with the creamy, tasty combination of ingredients that deliciously meld together when baked. Loaded with tender summer squash, the béchamel sauce with creamy corn, crackers, and a buttery taste, it’s an authentic Southern comfort food knock-it-out-of-the-ballpark recipe that will win a homerun with everyone at your table.
Especially for the simplicity of making it!
P.S. When you try this recipe, let us know how you like it! Leave a comment below, share it, and rate it – it’s super helpful for other readers and us. Just click the blue-green comment bubble on the bottom right of your screen to jump to the comment area below.
NO Need to Look for Your Calculator:
Adjusting the serving size of recipes is easier than you may think.
To change the number of portions that a recipe makes go to the “Servings” quantity in the recipe section below. Hover over the servings amount and a slider box will appear above the amount. Slide the toggle to adjust the desired number of portions you want to make. Please note that the ingredient measures will change to decimal equivalents when the serving amount is adjusted.
Need more help with cooking and recipe conversions? Head to the Good Cooking’s Recipe Conversions Guide for their online collection of helpful links!
How to Make Simply Scrumptious Southern Summer Squash Casserole
(Click to prevent your screen from going dark.)
Ingredients
Equipment
Nutrition
Method
- Preheat the oven to 350°F and lightly butter the bottom and sides of a 9 x 12-inch oven-safe baking dish.
- Prepare the summer squash/zucchini by slicing them into thin coins about 1/8-inch thick. Then crush the saltines and set them aside until needed.2 medium Summer Squash/Zucchini, 24 gluten-free Saltine crackers
- Melt three tablespoons of butter in a small saucepan over medium-low heat, immediately whisk in the flour and simmer for 1-2 minutes to make a white roux that is slightly puffed and bubbly.3 tablespoons Butter, 3 tablespoons gluten-free all-purpose Flour
- Add the milk a little at a time while whisking until smooth and silky. Stir in the broth base seasoning, salt, and pepper to taste, then stir in the sweet corn.2 cups whole Milk, 2 teaspoons Chicken Broth Base & Seasoning, Salt, White Pepper, 1 cup Sweet Corn Kernels
- Spread an even layer of sauce and corn mixture (about one-third) over the bottom of the baking dish. Arrange an even layer of summer squash over the sauce and cover with crushed saltine crackers. Repeat the layers twice, beginning with the sauce, squash, then crackers, finishing with the crackers on top. Divide the remaining tablespoon of butter into thin pats, and place on top before baking.
- Bake for 45 minutes to one hour until the casserole is set. The edges should be bubbly, and the topping will turn a beautiful golden brown.
Kitchen Notes
Make it in Advance
Assemble the Casserole in advance. Once everything is layered into your oven-safe baking dish, cover it tightly with plastic wrap or aluminum foil and refrigerate for up to 24 hours until ready to bake. Before baking, let the casserole sit on the counter to warm to room temperature for at least 30 minutes before putting it in the oven. Please note that if the contents are still cold, you may need to extend the baking time by a few minutes until it becomes bubbly around the edges and the top is golden brown.
Variations:
- Add a pinch or two of fresh herbs such as basil, parsley, thyme, or oregano. Even freshly chopped chives would be a great addition for adding another flavor layer!
- Instead of saltines, substitute gluten-free dry stuffing mix with melted butter for a flavorful topping (or use buttery club crackers or Ritz crackers – but only if you don’t need to be gluten-free). Other good options you might want to try might be gluten-free corn flakes or panko-style breadcrumbs.
- Use zucchini instead of summer squash, or try a combination of the two.
- Cooking for only a few? Adjust the recipe by changing the number of portions. We make it easy to adjust the servings size. CLICK HERE to learn how.
Personal Notes
Tried this recipe?
Please consider Leaving a Review!This recipe may contain affiliate links. For more information, visit our Affiliate Disclosure.
- Budget-Friendly Recipes, Casserole & Sheet-Pan Recipes, Casserole Recipes, Casserole Side Dish Recipes, Classic Recipes, Comfort Food Recipes, Fall Side Dish Recipes, Garden & Market Fresh Recipes, Healthy Dinner Recipes, Healthy Side Dish Recipes, Side Dish, Side Dish Recipes for One or Two, Southern Recipes, Summer Side Dish Recipes, Vegetable Side Dish Recipes
Recipe Card powered by WP Recipe Maker
(Nutritional values are an approximation. Actual nutritional values may vary due to preparation techniques, variations related to suppliers, regional and seasonal differences, or rounding.)
Copyright © 2017-2026 Kymberley Pekrul | GfreeDeliciously | gfreedeliciously.com | All content and photographs are copyright protected. Sharing this recipe is both encouraged and appreciated. However, copying and/or pasting full recipes on social media is strictly prohibited. Please read my Photo Use Policy for detailed guidelines and further clarification.
