Zucchini au Gratin

So I made the best zucchini au gratin ever a couple of nights ago. It was so good that I ate half the 9x13 pan in one sitting. I justified that by the fact that zucchini is a vegetable, no matter how much cheese sauce was on it, and therefore, good for me, and it was pretty much all I ate for dinner that night anyway. I doubt I'll ever be able to replicate the recipe again. But, I'll definitely try.

1 large zucchini/mixed summer squash, cut into chunks
1/2 cup sour cream
1-2 Tbsp vermouth
1 1/2 cup cheddar cheese, grated
1/4 cup parmesan, grated
bread crumbs

Mix everything, except the bread crumbs, in a casserole dish. Bake, covered in tin foil, for 35 minutes at 300. Stir, re-cover, and put back in the oven for another 15-20 minutes, or until the squash is tender. Sprinkle the bread crumbs over the top (and some more parmesan, if you like!) and put under the broiler until browned.

Now, I made this again a few nights later but I didn't have sour cream or cheddar cheese. What ever did I do, you ask? I used plain yogurt and gouda. Still delicious, although the gouda kind of clumped together so it required more stirring.