Grandma's Old-Fashioned Zucchini Pie Recipe

Grandma’s old-fashioned zucchini pie is a savory American-style pie filled with tender zucchini, sweet onion, eggs, and melted cheese in a flaky pastry crust. Salting and briefly cooking the zucchini first keeps the filling from turning watery, while a short rest after baking helps each slice hold together.

Ingredients

1 unbaked 9-inch (23 cm) refrigerated pie crust, about 9 oz (255 g)
2 lb (900 g) medium zucchini, ends trimmed
1 tsp (6 g) fine salt, for drawing moisture from the zucchini
1 tbsp (15 ml) olive oil or unsalted butter
1 medium yellow onion, about 6 oz (170 g), finely chopped
2 garlic cloves, about 6 g, minced
3 large eggs, about 150 g without shells
½ cup (120 ml) whole milk
1 cup (100 g) shredded sharp cheddar cheese
½ cup (50 g) finely grated Parmesan cheese
1 tbsp (4 g) chopped fresh parsley, or 1 tsp (1 g) dried parsley
½ tsp (1 g) dried thyme
¼ tsp (0.5 g) black pepper
⅛ tsp (0.3 g) ground nutmeg, optional
1 tbsp (10 g) all-purpose flour

The flour is a small but useful addition: it helps bind the juices released by the vegetables without making the pie heavy. Sharp cheddar gives the filling a familiar, full flavor, while Parmesan adds a salty, savory edge. If you do not have Parmesan, use an extra ½ cup (50 g) of cheddar; the pie will be milder and a little less savory. Whole milk makes a soft, custardy filling, but 2% milk works too.

Instructions

Prepare the crust and oven. Set a rack in the middle of the oven and heat it to 375°F (190°C). Fit the pie crust into a 9-inch (23 cm) pie plate, pressing it gently into the corners without stretching it. Crimp the edge, prick the bottom several times with a fork, then line the crust with parchment and fill it with pie weights or dry beans. Bake for 7 minutes, remove the parchment and weights carefully, and bake for 3 minutes more. Set the crust aside. It should look dry but not browned. Keep the oven on.
Salt and drain the zucchini. Coarsely grate the zucchini, or cut it into thin half-moons if you prefer a more distinct vegetable texture. Toss it with 1 teaspoon salt in a colander set over a bowl. Leave it for 10 minutes, then squeeze it firmly by handfuls over the sink or bowl. Removing this excess liquid is important: zucchini holds a lot of water, and skipping this step can leave a soggy bottom and a loose filling. You should have roughly 4 cups (about 500 g) of squeezed zucchini, though the exact amount varies by vegetable size.
Cook the onion and zucchini. Warm the oil or butter in a large skillet over medium heat. Add the chopped onion and cook for 3 minutes, stirring, until it begins to soften. Add the garlic and cook for 30 seconds, then add the drained zucchini. Cook for about 4½ minutes, stirring often, until the zucchini is hot and any remaining visible moisture has mostly evaporated. Take the skillet off the heat and let the vegetables cool for a few minutes so they do not begin cooking the eggs when combined.
Mix the custard. In a large bowl, whisk the eggs with the milk, parsley, thyme, pepper, nutmeg if using, and flour until the flour is evenly dispersed. Stir in the cheddar and Parmesan. Fold in the warm zucchini and onion mixture. Taste a small piece of the cooked vegetables before adding any extra salt; the salted zucchini and cheeses may already make the filling sufficiently seasoned.
Fill and bake. Pour the mixture into the par-baked crust and spread the vegetables evenly. Bake for 42 minutes, until the center looks set rather than liquid and the top is lightly golden in spots. Check the middle with a food thermometer without touching the pie plate: egg dishes should reach 160°F (71°C), the USDA FSIS safe minimum internal temperature. If the center has not reached that temperature, return the pie to the oven and check again after a few minutes. The edge may puff slightly while baking and settle as the pie cools.
Rest before slicing. Set the pie on a cooling rack and leave it undisturbed for 15 minutes. This short rest lets the custard firm up, so slices are neater and less likely to slump. Cut into six wedges with a sharp knife and serve warm, or let it cool further for a room-temperature meal.

Tips

Get the moisture out. After salting, squeeze the zucchini firmly in clean hands or wrap it in a clean kitchen towel and wring it out over the sink. Do not rinse it after salting; rinsing adds water back and washes away seasoning. If your zucchini is especially large and seedy, scoop out the soft seed core before grating.
Keep the crust crisp. The brief pre-bake gives the bottom crust a head start before it is covered with wet filling. Use pie weights or dry beans so the pastry does not puff. If the crust edge starts browning too quickly during the main bake, cover just the edge loosely with foil.
Season with restraint. The zucchini is salted before cooking, and both cheeses contribute salt. Taste the cooked vegetable mixture before assembling, then add a pinch of salt only if it seems bland. This is more reliable than seasoning the egg mixture heavily at the start.
Let the filling cool slightly. The vegetables do not need to be cold, but adding them while they are piping hot can partially set the eggs in the bowl. A few minutes off the heat is enough. Mix gently so the filling stays evenly distributed rather than turning into a dense layer.

Serving Suggestions

Serve a warm wedge with a crisp green salad dressed with vinaigrette, sliced tomatoes, or lightly dressed cucumbers. The pie is rich enough to be the main part of a light lunch, but it also works beside roasted potatoes or a bowl of soup for a more filling supper. At brunch, pair it with fresh fruit and toast; the savory cheese and herbs balance sweeter sides well.

For a casual meal, let the pie sit for 15 minutes and bring it to the table in its plate, then cut it into wedges. If you are serving a crowd, smaller slices are practical alongside other dishes. A little chopped parsley or extra black pepper on top is enough garnish; the browned cheese and zucchini already give the pie plenty of character.

Variations

Use a different cheese: Replace the cheddar with Swiss, Gruyère, or Monterey Jack in the same quantity. Swiss and Gruyère make the flavor nuttier, while Monterey Jack keeps it mild and melts smoothly. Keep some Parmesan if possible for its concentrated savory flavor.

Add fresh herbs: Use 1 tablespoon (about 3 g) of chopped basil or dill in place of the parsley. Basil makes the pie taste brighter and summery; dill gives it a more pronounced herbal note. Fresh chives, about 2 tablespoons (6 g), are another good addition with the onion.

Make it without a crust: Butter a 9-inch (23 cm) pie plate well, then pour in the same filling and bake until the center reaches 160°F (71°C). A crustless pie is softer around the edges and will need careful slicing, but it keeps the zucchini-and-cheese character of the original. Check it a little earlier than the crusted version because the filling sits in a shallower layer.

Use yellow summer squash: Substitute yellow summer squash for some or all of the zucchini, keeping the total at 2 lb (900 g). Salt and squeeze it in the same way. Avoid adding tomatoes or other very wet vegetables unless you cook and drain them first; extra liquid can prevent the filling from setting neatly.

Storage and Reheating

Let leftover pie cool, then refrigerate it within 2 hours of baking. Cover the pie plate tightly or transfer individual slices to an airtight container. It keeps for 3 to 4 days in the refrigerator. For the best texture, avoid leaving slices at room temperature for extended serving; return them to the refrigerator after the meal.

Reheat individual slices in a 325°F (165°C) oven for about 12 to 18 minutes, until hot throughout. A microwave also works: heat a slice on a microwave-safe plate in 30-second intervals, checking between intervals. Microwave reheating softens the crust, while the oven helps it stay firmer. Leftovers should reach 165°F (74°C) when reheated, in line with USDA FSIS guidance.

To freeze, cool the pie completely, wrap it tightly, and freeze for up to 2 months for best quality. Thaw it overnight in the refrigerator, then reheat slices in the oven. Freezing can make the zucchini release a little moisture, so the texture may be softer than when freshly baked. Do not freeze a pie that has already been left out for more than 2 hours.

Frequently Asked Questions

Should I peel zucchini before making zucchini pie?

No. The skin of ordinary medium zucchini is tender and can stay on; it also gives the filling little flecks of green. Wash and dry the zucchini, then trim off the ends. If using an unusually large zucchini with tough skin or a spongy, seedy center, peel it and remove the core for a more even texture.

Can I make the pie ahead of time?

Yes. Bake it up to a day ahead, cool it, cover it, and refrigerate it. Reheat it in a 325°F (165°C) oven until hot throughout, or serve it chilled or at room temperature if that is your preference. You can also prepare and squeeze the zucchini a day ahead, then keep it covered in the refrigerator; assemble and bake the pie closer to serving for the freshest crust.

Why did my zucchini pie turn out watery?

The most common reason is that too much liquid remained in the zucchini. Salt it for 10 minutes, squeeze it well, and cook it until the pan is not visibly wet before mixing it with the eggs. A pie can also seem loose if it is sliced immediately after baking. Give it the full 15-minute rest, and make sure the center reaches 160°F (71°C).

Can I use a frozen pie crust?

Yes, use a 9-inch (23 cm) unbaked frozen crust and follow its package directions for thawing or pre-baking. Crust brands differ, so do not assume every frozen shell needs the same handling. The goal is a crust that is partially baked and dry before the filling goes in; a completely raw crust is more likely to stay pale and soft underneath.

How can I tell when the pie is done without overbaking it?

Look for a center that is set with only a slight wobble, not a liquid ripple, and check the middle with a food thermometer. The egg filling must reach 160°F (71°C); the temperature is a more dependable guide than browning alone. Remove the pie once it reaches the safe minimum, then let carryover heat and the resting time finish settling the custard.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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Grandma’s Old-Fashioned Zucchini Pie Recipe