Sunday Supper: Squash Casserole

Yellow squash from the garden to the cutting board to the oven — that is the shortest distance between a summer vegetable and something worth writing a column about.

If you have ever had the privilege of walking outside to your own garden to grab fresh vegetables for supper, you understand how different it feels from picking them up at the grocery store or even the farmers' market. The distance from vine to table is measured in footsteps rather than miles. The squash has not spent a day in a refrigerated truck, and the cook who picks it knows exactly how long it has been growing and exactly when it is ready.

A garden squash casserole and a grocery store squash casserole are technically the same dish. In practice, they are separated by the kind of flavor that comes only from produce that went from the plant to the kitchen inside an hour. Missing that is a real loss, and anyone who has cooked from a summer garden knows precisely what that means.

The garden that provided squash for this casserole is gone now, which is the kind of thing that happens in the course of a life and is mourned quietly, without making too much of it. What remains is the recipe, the technique, and the understanding of what made it worth making in the first place. Grocery store squash, chosen carefully at its summer peak, can get you most of the way there. The rest is memory and seasoning.

The Squash

Yellow summer squash is what goes into Southern squash casserole, and the specific variety matters less than the size and freshness. Small to medium squash, 4 to 6 inches long, are at their best. They are tender all the way through, with thin skin, small seeds, and a mild sweetness. Large squash – the ones that got away in the garden and grew to the size of a small club – have developed seeds and a fibrous texture that no amount of cooking can improve.

Slice the squash into rounds about a quarter-inch thick. They cook down dramatically. A pound of raw squash becomes considerably less once the water is released, which is expected and important to remember when estimating how much to make. Two pounds of squash is the right amount for a standard casserole that will feed six people as a side dish.

The water content in summer squash is the primary technical challenge of the casserole. Squash is largely water, and the water released during cooking turns a squash casserole from a firm, scoopable dish into a watery one. Managing that moisture is the central skill the recipe requires.

Managing the Moisture

Cook the squash before it goes into the casserole. Sauté the sliced squash and diced onion in butter over medium heat until the squash is tender and has released most of its liquid. Then tip everything into a colander and press gently to drain. This step removes most of the excess moisture before it has a chance to pool in the bottom of the baking dish.

Do not skip this step, and do not rush it. Squash that has not been properly drained produces a casserole that separates in the oven, the liquid migrating to the bottom while the top dries out. The precook takes 15 minutes and makes the difference between a casserole that holds together and one that does not.

After draining, taste the squash. It should already be well-seasoned and deeply flavored at this stage. If it tastes bland, season it now rather than hoping the other ingredients will compensate later. Salt draws out moisture, so season after draining.

The Binder

Eggs and sour cream, combined with a generous amount of sharp cheddar cheese, hold the casserole together and give it character. The eggs set during baking, providing structure. The sour cream adds a tangy richness that plain cream cheese or mayonnaise does not. Sharp cheddar, shredded fresh from the block rather than pre-shredded from a bag, melts evenly into the filling and contributes a flavor that mild cheddar simply cannot.

For a standard 2-pound squash casserole:

• 2 pounds yellow summer squash, sliced and precooked
• 1 medium onion, diced and cooked with the squash
• 2 eggs, beaten
• 1/2 cup sour cream
• 1 cup sharp cheddar, freshly shredded and divided
• 2 tablespoons butter
• Salt, black pepper, and garlic powder, to taste

Combine the drained squash and onion with the eggs, sour cream, half the cheese, butter, and seasonings. Pour into a buttered baking dish. Reserve the other half of the cheese for layering under the topping.

The Topping

Crushed Ritz crackers with smoked paprika and a pinch of cayenne. That is the topping, and it earns its place on the casserole more completely than any other option.

Ritz crackers bring butter flavor and a crisp texture that breadcrumbs approximate but do not match. Crushed to a rough crumb rather than a fine powder, they produce a topping with variation. Some pieces stay crunchier longer, some absorb a little of the casserole’s steam and soften at the edges, and the result is more interesting than anything uniform. The smoked paprika adds a faint woodsy depth that plays against the sweetness of the squash, and the cayenne adds a quiet heat at the finish that most people cannot identify but would notice immediately if it were absent.

For the topping:

• 1 sleeve Ritz crackers, crushed to rough crumbs
• 1 teaspoon smoked paprika
• 1/4 teaspoon cayenne pepper
• 2 tablespoons melted butter, tossed through the crumbs

Sprinkle the remaining shredded cheese over the casserole filling first, then add the cracker topping. The cheese layer melts and acts as a kind of adhesive between the filling and the crust, keeping the topping from sliding off when the casserole is served.

Breadcrumbs are a perfectly acceptable alternative for anyone without Ritz crackers on hand or anyone who prefers a finer, more uniform crust. Panko breadcrumbs tossed with melted butter, smoked paprika, and cayenne produce a lighter, crispier topping that some people prefer. Seasoned plain breadcrumbs work too, though they tend to absorb moisture from the casserole steam more readily and lose their crunch faster. Whatever topping you choose, the smoked paprika and cayenne are not optional in my kitchen. They are what elevate the crust from neutral to necessary.

The Baking Process

Bake at 350 degrees for 30 to 35 minutes, until the topping is deep golden and the casserole is set and bubbling at the edges. The center should not be liquid when the pan is gently shaken. A properly made squash casserole, with the moisture managed correctly, will come out of the oven firm enough to scoop cleanly and hold its shape on the plate.

Let it rest for 10 minutes before serving. The interior continues to set as it cools slightly, and a casserole cut too soon will be looser than it should be. Ten minutes is not long to wait for something that took this much attention to build.

What Makes It a Summer Dish

Squash casserole appears year-round on Southern tables, made from grocery store squash in January when the alternative is going without. Nothing wrong with that. But it is fundamentally a summer dish, tied to the time of year when yellow squash comes in faster than any family can eat it fresh, and the question of what to do with the abundance becomes a genuine logistical concern.

A garden in full summer production is generous to the point of overwhelming. The squash comes in every other day, each one a little larger than the one before it, and the cook’s job is to stay ahead of it. Squash casserole, sautéed squash, grilled squash, squash bread, squash soup. The summer squash repertoire exists because necessity built it, the same way the best of Southern cooking has always been built.

Make this casserole in late May or June, when the local squash arrives at farm stands and markets. Make it from garden squash if you have a garden, from your neighbor’s garden if they are generous, or from the best squash the season offers wherever you find it. The effort is the same regardless of where the squash came from. What changes is the flavor, and the flavor changes everything.

A Note on the Summer Squash Surplus

Anyone who has grown yellow squash knows the particular abundance problem it creates. A single plant produces more squash than most families can eat, and a garden with two or three plants can outpace the cook’s ability to use them almost immediately once the season hits its stride.

The traditional solution is neighbors. A bag of squash left on a porch, a box at the end of the driveway with a handwritten “free” sign, or a casserole carried next door because there is simply too much to use alone. The summer squash surplus has been building community in this part of Tennessee for as long as people have been growing gardens here, and it is one of the more pleasant forms of agricultural abundance to be on either side of.

If your garden is producing faster than your kitchen can keep up with this summer, bless a community member. A neighbor’s abundance is another neighbor’s good supper.

Ritz crackers or breadcrumbs? Do you cook your squash before it goes in the casserole? Is there a garden, past or present, that you cook from in the summer – or a neighbor whose garden you gratefully benefit from? Email larder@mcobserver.news or message us on Facebook.