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Preheat your oven to 375°F (190°C) and line a baking dish with aluminum foil.
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In a large bowl, combine the mashed potatoes, egg yolks, cheddar cheese, milk, melted butter, salt, pepper, and garlic powder. Mix until smooth and well combined.
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In a separate bowl, beat the egg whites until stiff peaks form.
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Gently fold the beaten egg whites into the potato mixture, being careful not to deflate them.
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Pour the mixture into the prepared baking dish and smooth the top with a spatula.
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Bake in the preheated oven for 25–30 minutes, or until the soufflé is puffed and golden brown on top.
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Remove from the oven and sprinkle with chopped chives, if using. Serve immediately.
Variations & Tips:
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For a cheesy twist, try adding a mix of your favorite cheeses such as Gruyère or Parmesan along with the cheddar.
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You can sneak in finely chopped cooked broccoli or spinach for extra nutrition.
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Add a pinch of cayenne pepper or a dash of hot sauce for a bit of heat.
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For a gluten-free version, ensure the mashed potatoes are made without flour or any gluten-containing ingredients.