Zucchini bread or cakes would do well.

You can make potato latkes with them and replace half of the shredded potato with zucchini - just drain well.
You can make chocolate zucchini cake too. Its the most moist chocolate cake I've ever eaten!

I wonder, though, if such large zucchinis would be too tough in these recipes?

Shred them finely and use for zucchini flavor.

I have a folder devoted to zucchini and many use shredded zucchini. For big ones, discard center seeds since seeds are too woody. You might have to peel depending on how tough the skin seems. One of my favorite recipes is for zucchini chocolate chip cookies. The chocolate zucchini bread is more like a brownie. Zucchini currant pancakes are like carrot cake. You can use up lots of chopped zucchini if you make relish. Also have a zucchini whoopie pie recipe. It will not be too tough in bake recipes.

Yes, if not dry, corky or cotton, I do this with large zukes.

I wash them well. I grate from the outside in to about .75" or 1" because I want a the vitamins and photochemical nutrients, along w a bit of pulp. Set aside. Slice the rest of the very large zucchini longitudinally in half. I leave those parts seed side up for the birds in my compost area.

I have a "jelly" bag (easy to stitch one up) into which I put the grated dark green skin and exterior pulp. I squeeze out the juice (you can drink or save for soup, I suppose).

Then I use a simple easy recipe for zucchini bread (IIRC Redbook paperback cookbook), but I change some of the ingredients around. Since I express liquid from the grated zucchini, I can and more of it. I use some of the AP flour, but add some fresh (keep in fridge) bran flakes. I add raisins and chopped walnuts. Maybe I put a bit more leavening in as well.

This gives me a more nutritious zucchini bread (than the go hum recipe) and I the tiny flecks of green skin look healthful. The loaf has good structure and texture and slices well w a bread knife (thin serrated one). That particular recipe includes a few spices like cinnamon and ?allspice or nutmeg (offhand, I can't recall).

As for the composting and seeds, you can scrape the seeds out for the birds, then just chop or purée then compost the rest of the squash if you want to avoid attracting critters.

Let us know what you do with your zukes.

Google any recipes for 'Marrows' and you'll get a stack of ideas from the UK. Not bone marrow but vegetable marrow. Here are some to start you off. Marrow recipes

Grate it up and make some zucchini soup.

Give them to neighbors , put wheels on them and have a zucchini race! Carve little faces in them for dollies and give them to the neighbor kids (my daughter loved her zuk dollies!), grate and either dehydrate or drain and freeze to add to soups/stews for the winter. Grate and freeze for bread.

Go to the harvest forum and do a search. There will be plenty of stuff!

Oh, by the way, August 8th is " leave a zucchini on your neighbor's porch day!"

I had the same problem! Went away for a week....and KABOOM! Nancy

Thanks, everyone... These are all great suggestions. Today I made some zucchini fritters and also zucchini bread (though, really, some of these zucchini bread recipes should be called "sugar bread with a pinch of zucchini").

I have never understood the point of trying to eat overgrown and tasteless zucchini when the plant produces so many fruit so fast. Feed the giants to the compost heap and wait two minutes for some young tender ones.