A delightful casserole featuring caramelized onions and Gruyère cheese, perfect for any occasion.
Preheat your oven to 350°F (175°C).
Always preheat your oven to ensure even cooking.
Peel and thinly slice the sweet onions.
Use a sharp knife for precise and safe slicing.
In a large skillet, melt half of the butter over medium heat. Add the onions and cook, stirring occasionally, until they are golden and caramelized, about 20 minutes.
Caramelizing onions slowly enhances their natural sweetness.
In a mixing bowl, whisk together the eggs, heavy cream, salt, and black pepper.
Ensure the mixture is well combined for a smooth texture.
Layer half of the caramelized onions in a greased casserole dish. Sprinkle with half of the Gruyère cheese and half of the breadcrumbs. Repeat the layers.
Layering ensures even distribution of flavors.
Pour the custard mixture evenly over the layered ingredients in the casserole dish.
Pour slowly to avoid disturbing the layers.
Melt the remaining butter in the skillet and toss with the remaining breadcrumbs. Sprinkle this mixture over the top of the casserole.
The buttery breadcrumbs add a delightful crunch.
Bake the casserole in the preheated oven for 25-30 minutes, or until the top is golden and the custard is set.
Check for doneness by inserting a knife into the center; it should come out clean.
Let the casserole cool slightly before serving. Enjoy your Caramelized Onion and Gruyère Bake!
Allowing the casserole to cool slightly makes it easier to serve.
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