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a black serving spoon scooping zucchini gratin with yellow squash out of a skillet
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5 from 2 votes

Zucchini & Squash Au Gratin Casserole

This baked squash au gratin casserole features layers of tender sliced zucchini and yellow squash bathed in a rich cream sauce with a golden brown crust of tangy cheese on top. It's a must have Southern side dish at any summer supper that's ready in just 30 minutes.
Prep Time10 minutes
Cook Time25 minutes
Total Time35 minutes
Course: Casserole, Dinner, Side Dish
Cuisine: American, Southern
Servings: 6
Calories: 191kcal

Ingredients

  • 2 tbsp butter
  • 1 zucchini sliced
  • 1 yellow squash sliced
  • 2 shallots minced
  • 1 tsp minced garlic
  • 1/2 cup heavy cream or half and half
  • Salt & Pepper to taste
  • pinch dried oregano
  • 1/4 cup Parmesan cheese
  • 1 cup Shredded Cheese mozzarella or provolone works best

Instructions

  • Melt butter in a large skillet over medium heat. When melted add in the shallots and garlic, and saute until they begin to turn clear.
  • Next, add the zucchini, squash and cream. Give it a stir and then add the salt, pepper, and Parmesan.Cook the mixture 8 to 10 minutes over medium-medium low, stirring occasionally. You do not want it to boil, only lightly simmer.
  • Pour the mixture into a baking dish and sprinkle the top with a little more Parmesan and evenly distribute the shredded cheese over top.
  • Bake for 10 to 14 minutes at 450 degrees, or until the casserole is bubbly and golden brown on top.

Notes

  • To make clean up easier, lightly spray your baking dish with non stick cooking spray before using.
  • Don't overcook your squash, you want it to be soft but not mushy in the skillet. It will continue to soften during baking.
  • You can make this in a cast iron skillet from start to finish (since it's oven safe) and not have to worry about transferring or dirtying another dish. Just know those dishes tend to cook hotter and retain heat longer.
  • For more flavor, use bacon grease in place of butter.

Nutrition

Calories: 191kcal | Carbohydrates: 5g | Protein: 7g | Fat: 16g | Saturated Fat: 10g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 50mg | Sodium: 224mg | Potassium: 239mg | Fiber: 1g | Sugar: 3g | Vitamin A: 698IU | Vitamin C: 12mg | Calcium: 172mg | Iron: 0.5mg