Mushroom Zucchini au Gratin
Mushroom Zucchini au Gratin may sound like a fancy dish, but its story comes from something wonderfully simple, the old French love of baked, golden-topped comfort food. The word gratin actually comes from gratter, which means “to scrape.” Long ago, French cooks would scrape the crispy bits of cheese and bread from the edges of the pan, enjoying the flavorful crust that became the signature of a good gratin.
The first gratins were all about making use of what was on hand. Potatoes, cream, and cheese were common ingredients, and dishes like Gratin Dauphinois became household favorites. Over time, cooks started experimenting with other vegetables that could hold up under heat and cream. Zucchini became a natural choice. Its soft, mild texture and ability to soak up flavor made it a hit in kitchens across Europe, especially as people began to explore lighter, vegetable-forward dishes.
Mushrooms joined the mix a little later, bringing depth and richness to the traditional gratin. Their earthy flavor pairs perfectly with the creamy, cheesy base. By the late twentieth century, as vegetarian cooking became more popular, the combination of mushrooms and zucchini started appearing in both restaurants and home kitchens. It was a delicious way to honor the French spirit of gratinage while embracing the fresh, local ingredients that modern cooks love.
Today, Mushroom Zucchini au Gratin feels like a warm hug from the oven. It’s elegant enough for a dinner party yet cozy enough for a family meal on a chilly evening. The dish captures everything we love about comfort food, creamy layers, and flavors that taste both familiar and new.
In many ways, it tells the story of how food traditions evolve. What started centuries ago in French country kitchens has grown into a modern favorite that celebrates both simplicity and creativity. Whether you serve it as a side or make it the star of the table, Mushroom Zucchini au Gratin carries the heart of home-cooked warmth with every bite.
Mushroom Zucchini au Gratin
prep time: 30 minutes
bake time: 15 minutes
oven temperature: 400°F
servings: 6
Ingredients:
1 lb (16 oz) fresh mushrooms, sliced
1 medium onion, diced
1 large zucchini, sliced
4 tablespoons butter
2/3 cups sour cream
2 tablespoons flour
1/2 teaspoon salt
1/2 teaspoon garlic powder
1/8 teaspoon black pepper
1/8 teaspoon paprika
1/2 cup fresh chopped parsley
1/2 cup shredded Gruyère cheese
1/2 cup shredded Swiss cheese
Instructions:
- Preheat the oven to 400°F.
- In a medium skillet on low to medium heat, sauté sliced mushrooms in butter until soft. Add diced onions, cook until translucent. Add the zucchini, cook until slightly softened.
- In a small bowl, blend the sour cream, flour, salt, garlic powder, paprika, and pepper. Stir into the mushrooms and heat to boiling then remove from the heat immediately. Pour into a small ungreased casserole dish.
- Combine the parsley and shredded Gruyère and Swiss cheese, sprinkle on top of the casserole. Bake uncovered for 10 to 15 minutes, or until the cheese is bubbling. Enjoy!
Pull up a chair and join me at the American table.
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about the AUTHOr
Stasia Wimmer Boschetti is an American culinary writer and the founder of American Country Living, where she writes about recipes, home, and the traditions that shape everyday American life. With more than thirty years of experience in the kitchen and a background in catering, she explores the history behind the foods we keep making and the customs that keep them in use. She is also the founder of the American Country Living General Store, offering homewares, baking goods, and provisions for everyday life at home. She lives in Texas with her husband, family, and five rescued animals, where she continues to cook, write, and keep a well-loved home.
