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Cheesy Scalloped Zucchini Recipe

Cheesy Scalloped Zucchini Recipe

Tender zucchini slices baked in a creamy, garlicky cheese sauce with a crisp, golden topping. Comforting, lighter than potatoes, and weeknight-friendly.
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Prep Time: 20 minutes
Cook Time: 35 minutes
Total Time: 55 minutes
Servings: 6

Ingredients
 

Main Ingredients

  • 2 lb zucchini, thinly sliced about 1/8-inch thick
  • 1.25 tsp kosher salt plus more to taste
  • 0.5 tsp black pepper
  • 1 tbsp olive oil
  • 3 tbsp unsalted butter
  • 1 cup yellow onion, finely chopped
  • 2 tsp garlic, minced
  • 3 tbsp all-purpose flour
  • 2 cup whole milk warmed
  • 1 tsp Dijon mustard optional, for brightness
  • 0.5 tsp paprika
  • 1 tsp fresh thyme, chopped
  • 2 cup shredded sharp cheddar cheese loosely packed
  • 0.75 cup grated Parmesan cheese divided
  • 0.5 cup panko breadcrumbs

Instructions

Preparation Steps

  • Preheat oven to 375°F. Lightly oil a 9x13-inch baking dish.
  • Slice zucchini thinly. Sprinkle with a pinch of salt, then pat dry to reduce moisture.
  • Warm a large skillet over medium heat. Melt butter, then add onion and cook until soft, 4–5 minutes.
  • Stir in garlic and cook 30 seconds. Sprinkle in flour and whisk for 1 minute to form a roux.
  • Gradually whisk in warm milk. Add Dijon, paprika, thyme, remaining salt, and pepper. Simmer until thickened, 3–4 minutes.
  • Take off heat. Stir in cheddar and 1/2 cup Parmesan until smooth and creamy.
  • Spread a spoonful of sauce in the dish. Layer half the zucchini, half the sauce, remaining zucchini, then the rest of the sauce.
  • Combine breadcrumbs with olive oil and the remaining Parmesan. Sprinkle evenly over the top.
  • Bake until bubbling and golden, 25–30 minutes. Broil 1–2 minutes if you want extra color.
  • Rest 10 minutes before serving so the sauce sets. Garnish with extra thyme if you like.

Notes

Variation: Swap half the cheddar with Gruyère for a nutty finish, or add a pinch of red pepper flakes for gentle heat. Leftovers reheat well covered at 350°F for 10–12 minutes, or microwave in short bursts until warm.
This recipe is an original creation inspired by classic Cheesy Scalloped Zucchini Recipe flavors. All ingredient ratios and instructions are independently developed.