Yellow Squash Casserole is creamy and cheesy with a buttery and crispy Ritz cracker topping. It makes a delicious side dish and is perfect for using fresh summer squash. Yellow Squash Casserole with lots of cheddar cheese and a buttery cracker crumb topping is one of my favorite casseroles to make during the summer months. It’s super creamy with tender slices of summer squash and onion. A combination of mayonnaise and sour cream gives it plenty of creamy flavor. I love a squash casserole so much, I make multiple versions. While this one is my go to, I also love Pimento Cheese Squash Casserole, Squash Casserole with Stuffing Top, and Squash, Zucchini, and Corn Casserole. Want to save this recipe?Just enter your email and get it sent to your inbox! Plus you’ll get new recipes from us every week!Please enable JavaScript in your browser to complete this form.Please enable JavaScript in your browser to complete this form.Name *Email *Save How To Serve Serve Yellow Squash Casserole at a summer potluck or as a comforting side dish for a family meal. I love it with fried chicken. Actually, I think I love everything with fried chicken.   This recipe also makes a great holiday side. My som requests it every Thanksgiving and Christmas. Yellow squash is plentiful at farmers markets in the south during the summer months and it is easily grown in a home garden so I tend to make this casserole frequently during the summer months. But a creamy casserole like this is also extremely comforting during the cooler months. How To Serve (More detailed instructions and video in recipe card below.) Steam the squash and onion until tender. Season with salt and pepper. Mix together egg, mayonnaise, sour cream, and milk. Stir in cheese, squash, and onion. Transfer to baking dish. Scatter crushed crackers on top and drizzle with melted butter. Bake for 30 minutes. Yellow Squash Casserole Recipe Tip This casserole is really easy to make. You do want to precook the squash some because you don’t want it to be crunchy at all in the finished casserole. You can either slice it and sauté it, steam it, or even microwave it until just tender. ★★★★★What readers are saying This is so easy to make! The taste will take back to grandma’s with family all around eating, laughing and good food. Make Ahead and Storage Suggestions This recipe can be prepared through Step 5 a day in advance and refrigerated. Leftovers can be stored in an airtight container in the refrigerator for 4 days. More Southern Casseroles Southern Broccoli Casserole– with a buttery cracker crumb topping. Old-Fashioned Cabbage Casserole– people rave about this recipe. Pineapple Casserole– a unique blend of sweet and savory. Lima Bean Casserole– Creamy and cheesy. Crock Pot Sweet Potato Casserole Pin this now to find it laterPin It Print Yellow Squash Casserole Squash Casserole is creamy and cheesy with a buttery Ritz cracker topping. Course Side DishCuisine SouthernKeyword Casserole, Thanksgiving Prep Time 15 minutes minutesCook Time 30 minutes minutesTotal Time 45 minutes minutes Servings 6 servings Calories 303kcal Author Christin Mahrlig Ingredients4 medium yellow squash ends trimmed and cut into 1/4-inch slices1 medium onion slicedsalt and pepper1 egg lightly beaten1/4 cup mayonnaise1/3 cup sour cream1/4 cup milk1 cup heaping shredded cheddar cheese24 Ritz crackers2 tablespoons butter melted InstructionsPreheat oven to 350 degrees and lightly grease a casserole dish.Steam squash and onion until just tender, about 5 to 7 minutes.Season squash and onion with salt and pepper.In a large bowl, whisk together egg, mayonnaise, sour cream, and milk.Stir in cheese, squash and onion. Transfer mixture to casserole dish.Crush crackers and scatter on top of squash. Drizzle with melted butter.Bake for 30 minutes. Video NutritionCalories: 303kcal | Carbohydrates: 15g | Protein: 9g | Fat: 24g | Saturated Fat: 10g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 6g | Trans Fat: 0.3g | Cholesterol: 69mg | Sodium: 340mg | Potassium: 442mg | Fiber: 2g | Sugar: 6g | Vitamin A: 709IU | Vitamin C: 24mg | Calcium: 207mg | Iron: 1mg Originally posted May 28, 2016. Disclosure: This post contains affiliate links. The post Yellow Squash Casserole appeared first on Spicy Southern Kitchen.