Zucchini Gratin With Cheddar Cheese

zucchini gratin with cheese
Zucchini gratin with cheddar cheese. Laurent Rouvrais / Getty Images
  • 45 mins
  • Prep: 20 mins,
  • Cook: 25 mins
  • Yield: 6 to 8 Servings

This zucchini casserole is a rich and flavorful side dish with extra flavor from some cheddar cheese and optional crumbled bacon. A gratin is always a nice and relatively easy way to make a fancy side dish out of everyday vegetables. 

The casserole is a good choice for a holiday meal or Sunday dinner, and it is an excellent way to use prolific zucchini. The casserole can be made with all or part yellow summer squash as well. 

What You'll Need

  • 8 tablespoons butter, divided
  • 1 large onion, chopped
  • 2 pounds zucchini, sliced (approximately 6 cups)
  • 2 tablespoons flour
  • 1 cup milk
  • 1 teaspoon kosher salt, or to taste
  • freshly ground black pepper, to taste
  • dash nutmeg
  • 4 to 6 slices bacon, cooked until crisp, drained, crumbled, optional
  • 1 cup shredded cheddar cheese, shredded
  • 1 cup soft fresh bread crumbs

How to Make It

  1. In a large skillet over medium heat, melt 4 tablespoons of butter. Add the chopped onion and saute, stirring, until it is tender and translucent.
  2. Add the sliced zucchini to the skillet and reduce the heat to low; cover the pan and cook for 10 to 15 minutes, or until just tender. Remove the vegetables with a slotted spoon and set aside.
  3. Add 2 tablespoons of butter to the skillet and melt over medium-low heat. Add the flour and cook, stirring, for 2 minutes. Gradually add the milk to the flour and butter (roux) and continue cooking, stirring, until thickened. Add the kosher salt and freshly ground black pepper, along with a dash of nutmeg. 
  1. Taste the sauce and adjust the seasonings. Add the zucchini and onions to the sauce. 
  2. Transfer the mixture to the prepared baking dish. 
  3. Sprinkle crumbled bacon over the casserole if using, along with the shredded cheddar cheese.
  4. Melt the remaining 2 tablespoons of butter and toss with the bread crumbs. Sprinkle over the zucchini casserole.
  5. Bake in the preheated oven for 30 to 25 minutes, or until the topping is browned and the casserole is bubbling around the edges.

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Nutritional Guidelines (per serving)
Calories 411
Total Fat 28 g
Saturated Fat 15 g
Unsaturated Fat 8 g
Cholesterol 72 mg
Sodium 840 mg
Carbohydrates 28 g
Dietary Fiber 3 g
Protein 15 g
(The nutrition information on our recipes is calculated using an ingredient database and should be considered an estimate. Individual results may vary.)