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French Onion Zucchini Bake

French Onion Zucchini Bake

French Onion Zucchini Bake combines the amazing flavor of caramelized onions, fresh zucchini, and piles of melty gruyere cheese for a side dish that is sure to impress!

Course Side Dish
Cuisine American
Keyword french onion, French Onion Bake, French Onion Zucchini
Prep Time 10 minutes
Cook Time 35 minutes
Servings 8
Author Amanda Rettke - iambaker.net


  • 4 tablespoons unsalted butter
  • 1/2 teaspoon salt
  • 1/2 teaspoon pepper
  • 1 tablespoon Worcestershire sauce
  • 1 teaspoon fresh thyme, chopped (plus more for garnish)
  • 1/2 cup beef broth
  • 8 cups zucchini, seeded and sliced thin (about 2 medium)
  • 2 large yellow onions, sliced thinly
  • 2 teaspoons granulated sugar
  • 2 cups gruyere cheese, shredded and divided


  1. Preheat oven to 400 °F.
  2. Melt butter in a 12" skillet over medium heat.
  3. Add sliced onion to skillet and cook for 3-4 minutes.
  4. Add salt, pepper, sugar, Worcestershire sauce, thyme, and beef broth. Cook until onions are golden brown (about 12 minutes), stirring occasionally to prevent burning.
  5. Add zucchini to skillet and combine with onions. Add 1 cup of cheese and combine into onion mixture. Top the dish with the remaining cup of cheese.
  6. Transfer skillet to oven and bake for 15 minutes covered, remove the lid and cook for an additional 10 minutes or until golden brown.
  7. Carefully drain off any excess liquid and top with fresh thyme.