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Zucchini Gratin with Corn and Bacon

A cheesy zucchini gratin with corn, bacon, and gruyere cheese is the perfect way to enjoy fresh summer produce!

Prep Time
15 mins
Cook Time
1 hr 15 mins
Additional Time
10 mins
Total Time
1 hr 30 mins
Servings: 6 people
Calories: 336 kcal
Course: Side Dish , Lunch , Dinner
Cuisine: French , American

Ingredients

BREAD CRUMB TOPPING:
  • ¾ cup fresh bread crumbs*
  • 1 tablespoon salted butter, melted
FILLING:
  • 2 slices thick-cut bacon, chopped
  • 4 tablespoons salted butter
  • 1 medium onion, thinly sliced
  • 1 lb. zucchini, sliced ¼-inch thick (about 2 zucchini)
  • 2 cups fresh corn kernels (about 3 ears)
  • 1 teaspoon kosher salt, plus more to taste
  • Freshly-ground black pepper, to taste
  • ¼ teaspoon ground nutmeg
  • ¼ teaspoon garlic powder
  • 2 tablespoons all-purpose flour
  • 1 cup whole milk or cream, at room temperature
  • ½ cup grated gruyere cheese

Instructions

MAKE THE BREAD CRUMB TOPPING
    Cup of Yum
  1. Preheat oven to 350°F. In a small bowl, toss together bread crumbs and melted butter. Spread on a baking sheet. Bake until lightly browned, about 4 minutes.
PREPARE THE FILLING
  1. In a 10-inch cast iron skillet (or other oven-safe skillet), cook bacon over medium heat until crisp, about 6-8 minutes. Use a slotted spoon to remove bacon to a paper towel-lined plate, reserving the drippings in the pan.
  2. Add the butter to the skillet with the drippings. When the butter melts, stir in the onion and cook over medium-low heat until softened, about 10-12 minutes.
  3. Add the zucchini and corn, cover with a lid, and cook until tender, about 10 minutes. Add the salt, pepper, nutmeg and garlic powder; cook uncovered for 1 more minute.
  4. Stir in the flour and cook for 1 minute. Gradually add the milk or cream, stirring constantly. Cook over low heat for 2-3 more minutes, or until the sauce comes together and thickens.
  5. Sprinkle the cheese over top.
BAKE
  1. Transfer the skillet to the 350°F oven. Bake (uncovered) for 20 minutes. Sprinkle buttered bread crumbs and bacon over top. Bake for 5 more minutes, or until the dish is bubbly.
  2. Let stand for about 10 minutes before serving.

Notes

  • *To make ¾ cup fresh bread crumbs, start with about 1 ½ cups of cubed bread (I like to use a crusty loaf of sourdough bread). Process in a food processor until the cubes are coarse crumbs.
  • Use a mandoline to quickly cut the zucchini into even slices.
  • Fresh corn cut off the cob is best for flavor and texture. I like to add some of the starchy liquid from the cob to the dish as well, which adds great flavor and helps to thicken the sauce a little bit.
  • Use whole milk, half-and-half or cream -- do not substitute with a lower fat alternative. You need the fat in the milk to create a thick, rich sauce.
  • Garnish with fresh herbs like thyme, parsley or chives for a bright and colorful finishing touch.
  • While fresh sourdough breadcrumbs are the best, you can substitute with store-bought Panko breadcrumbs in a pinch.
  • I prefer fresh corn cut off the cob; however, you can substitute with frozen corn when necessary. If using frozen corn, you probably don't need to add it to the skillet until the zucchini is almost tender, because the frozen corn will soften quickly.
  • Swap out the zucchini (or some of the zucchini) for yellow squash.
  • If using regular bacon instead of thick-cut bacon, increase it to 3 slices.
  • Any good melting cheese will work for this recipe, so feel free to substitute with cheddar, Swiss, or Gouda in lieu of the Gruyere.

Nutrition Information

Serving 1/6 of the recipe Calories 336kcal (17%) Carbohydrates 29g (10%) Protein 11g (22%) Fat 21g (32%) Saturated Fat 11g (55%) Trans Fat 1g Cholesterol 49mg (16%) Sodium 710mg (30%) Potassium 455mg (13%) Fiber 3g (12%) Sugar 8g (16%) Vitamin A 751IU (15%) Vitamin C 18mg (20%) Calcium 203mg (20%) Iron 1mg (6%)

Nutrition Facts

Serving: 6people

Amount Per Serving

Calories 336

% Daily Value*

Serving 1/6 of the recipe
Calories 336kcal 17%
Carbohydrates 29g 10%
Protein 11g 22%
Fat 21g 32%
Saturated Fat 11g 55%
Trans Fat 1g 50%
Cholesterol 49mg 16%
Sodium 710mg 30%
Potassium 455mg 10%
Fiber 3g 12%
Sugar 8g 16%
Vitamin A 751IU 15%
Vitamin C 18mg 20%
Calcium 203mg 20%
Iron 1mg 6%

* Percent Daily Values are based on a 2,000 calorie diet.