![A shot of a zucchini gratin in a casserole dish with one servin g taken out](https://api.vip.foodnetwork.ca/wp-content/uploads/2015/03/Untitled-design-14.jpg?w=3840&quality=75)
Prep Time
10 min
Cook Time
55 min
Yields
6 servings
Copyright 1999, The Barefoot Contessa Cookbook, All Rights Reserved.
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ingredients
6
tbsp (3/4 stick) unsalted butter, plus extra for topping
1
lb(s) yellow onions, cut in 1/2 and sliced (3 large)
2
lb(s) zucchini, sliced 1/4-inch thick (4 zucchini)
2
tsp kosher salt
1
tsp black pepper, freshly ground
¼
tsp ground nutmeg
2
tbsp all-purpose flour
1
cup hot milk
¾
cup fresh bread crumbs
¾
cup Gruyère, grated
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directions
Step 1
Preheat the oven to 400ºF.
Step 2
Melt the butter in a very large (12-inch) saute pan and cook the onions over low heat for 20 minutes, or until tender but not browned. Add the zucchini and cook, covered, for 10 minutes, or until tender. Add the salt, pepper, and nutmeg and cook uncovered for 5 more minutes. Stir in the flour. Add the hot milk and cook over low heat for a few minutes, until it makes a sauce. Pour the mixture into an 8 by 10-inch baking dish.
Step 3
Combine the bread crumbs and Gruyère and sprinkle on top of the zucchini mixture. Dot with 1 tablespoon of butter cut into small bits and bake for 20 minutes, or until bubbly and browned.