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Zucchini Onion Pie

Zucchini onion pie is a crustless zucchini bake with a golden, custard-like interior and a deeply browned top. Thin-sliced zucchini and finely diced onion bake into an easy, savory egg-custard texture in a single pan.
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Prep Time 20 minutes
Cook Time 45 minutes
Resting 10 minutes
Total Time 1 hour 15 minutes
Servings: 8 servings
Course: Main Dish
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

zucchini
  • 4 cup zucchini Thinly sliced (about 4 medium).
onion
  • 1 onion Finely diced.
eggs
  • 4 eggs Beaten.
vegetable oil
  • 0.5 cup vegetable oil
parmesan cheese
  • 0.5 cup parmesan cheese Grated.
bisquick baking mix
  • 1 cup Bisquick baking mix
sharp cheddar cheese
  • 1 cup sharp cheddar cheese Shredded.
fresh parsley
  • 2 tbsp fresh parsley Chopped.
Italian seasoning
  • 1 tsp Italian seasoning
garlic powder
  • 0.5 tsp garlic powder
salt
  • salt To taste.
black pepper
  • black pepper To taste.

Equipment

  • 1 sheet pan

Method
 

Prep and mix
  1. Preheat oven to 350°F and grease a 9-inch pie dish or 9x9 baking pan.
  2. Mix eggs and vegetable oil together until combined.
  3. Stir in Bisquick baking mix, parmesan cheese, sharp cheddar cheese, fresh parsley, Italian seasoning, garlic powder, salt, and black pepper.
  4. Fold in sliced zucchini and diced onion until everything is evenly coated.
  5. Pour the mixture into the prepared dish and spread evenly.
Bake and rest
  1. Bake at 350°F for 40–45 minutes, until the top is deeply golden and a toothpick inserted in the center comes out clean (no wet batter).
  2. Rest for 10 minutes at room temperature before slicing so the custard sets and slices hold their shape.

Notes

For the cleanest slices, let the baked pie rest the full 10 minutes before cutting; if your zucchini is very watery, pat the slices lightly with paper towels to reduce steam. Refrigerate leftovers in a sealed container for up to 3–4 days. Freezing works for convenience: freeze slices in an airtight container up to 2 months, then reheat in the oven or microwave until warmed through. Dietary swap: use a dairy-free cheese blend and a dairy-free parmesan substitute to make it dairy-reduced while keeping the same bake time.