Cotton Patch Squash Casserole Recipe: Cheesy Baked Southern Tradition

This cheesy baked casserole transforms humble summer squash into a rich, comforting side dish that defines Southern tradition.

With a creamy sauce, crispy topping, and layers of tender squash, this recipe brings homestyle flavor to any meal. Simple ingredients come together for a dish that’s both hearty and satisfying.

Ingredients for Cotton Patch Squash Casserole

Transform summer squash into this rich, comforting Southern classic with pantry staples and cheese.

The squash is the foundation. Choose firm, medium-sized yellow squash—avoid the oversized ones, which can be bitter and watery. Most grocery stores carry it year-round, but peak season (late spring to early fall) yields the sweetest, most tender results. Whole Foods and local farmers markets often have superior quality. For the cheeses, block cheddar and Monterey Jack shredded at home melt better than pre-shredded, which contains anti-caking agents.

No Monterey Jack? Colby or pepper jack work well—adjust spice to taste. Half-and-half can replace whole milk for a lighter sauce, though full-fat gives the best texture. If you’re out of Dijon, yellow mustard at half the amount works in a pinch. The cracker topping is flexible: panko breadcrumbs or crushed cornflakes add a nice crunch. Fresh herbs like thyme or rosemary can be added to the sauce for extra depth.

Casserole keeps 3-4 days refrigerated in an airtight container. Reheat covered with foil at 350°F until warmed through. For freezing, assemble but don’t bake—wrap tightly and freeze for up to 2 months. Thaw overnight before baking as directed.

Step-by-Step Instructions for Cotton Patch Squash Casserole

This traditional method ensures a creamy, cheesy casserole with perfect texture every time.

Step 1: Prepare the Squash and Aromatics

Begin by thinly slicing the 2.5 lb Yellow Summer Squash into ¼-inch rounds. I find a mandoline gives the most consistent thickness, but a sharp knife works too. The uniform slices ensure even cooking throughout the dish.

Finely dice the Yellow Onion and mince the 2 cloves Garlic Cloves. Sauté them in a skillet with 1 tablespoon of the Unsalted Butter over medium heat until the onion becomes translucent and the garlic is fragrant—about 5 minutes. This builds the flavor foundation for your sauce.

Step 2: Create the Creamy Cheese Sauce

In a saucepan, melt the remaining Unsalted Butter over medium heat. Whisk in the 0.5 cup All-Purpose Flour to form a smooth roux. Cook for 1-2 minutes until it turns a light golden color—this removes the raw flour taste.

Slowly pour in the 1 cup Whole Milk, whisking constantly to prevent lumps. Stir in the 1 tbsp Dijon Mustard, 1 tsp Kosher Salt, and 0.5 tsp Ground Black Pepper. Remove from heat and stir in 1 cup Monterey Jack Cheese until melted and smooth.

Step 3: Combine and Layer the Casserole

In a large bowl, beat the 2 whole Large Eggs and mix them into the cheese sauce. Fold in the sautéed onion and garlic, then add the sliced Yellow Summer Squash. The mixture should be thick enough to coat the squash evenly.

Transfer the mixture to a greased 9×13-inch baking dish. Sprinkle the 2 cups Sharp Cheddar Cheese evenly over the top, then distribute the 1.5 cups Crushed Crackers as the final layer. The cracker topping will become golden brown and crisp during baking.

Step 4: Bake to Perfection

Preheat your oven to 350°F. Bake uncovered for 40-45 minutes until the casserole is bubbly around the edges and the topping is deep golden brown. You’ll know it’s done when a knife inserted in the center comes out clean.

Let it rest for 10 minutes before serving. This allows the sauce to set slightly, making it easier to slice. The finished casserole should have a creamy interior with a crisp, cheesy top layer that holds its shape when served.

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