Can this be made in under 30 minutes?

Yes, the recipe is designed to be quick and efficient.

Does it work for meal prep?

Most versions store well for one to three days.

Yes, simple swaps can be made for convenience or dietary needs.

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Preheat the oven to 375°F (190°C).
Grease a baking dish with a little butter or oil.
In a large bowl, mix the sweet potato slices, cranberries, heavy cream, salt, pepper, and nutmeg until evenly coated.
Layer half of the sweet potato mixture in the prepared baking dish.
Sprinkle half of the Gruyère cheese evenly over the first layer.
Add the remaining sweet potato mixture on top of the cheese layer.
Top with the rest of the Gruyère cheese and the breadcrumbs mixed with melted butter.
Bake for about 40 to 50 minutes, or until the sweet potatoes are tender and the top is golden brown.
Allow to cool slightly before serving.

Choose uniform sweet potatoes for even cooking. Let the gratin rest before serving for better slice retention.