Ingredients
0 of 8 availableMethod
- 1
Thinly slice the onions. Melt the butter in a large oven-safe skillet over medium-low heat. Add the onions and 1/2 teaspoon salt, then cook, stirring occasionally, until deeply golden and soft, 20 to 25 minutes.
25 minMedium-low heat - 2
Meanwhile, bring a large pot of salted water to a boil. Cook the macaroni until just tender according to the package directions. Drain well.
10 minBoiling water - 3
Reduce the skillet heat to low. Stir in the milk, remaining salt, and pepper. Add the macaroni, Gruyère, and cheddar, stirring until the cheeses melt and coat the pasta, about 2 minutes.
2 minLow heat - 4
Spread the macaroni evenly in the skillet and arrange the caramelized onions over the top. Broil 4 to 6 inches from the heat until bubbling and lightly browned, 2 to 3 minutes. Watch closely to prevent scorching.
3 minBroiler on high - 5
Let the skillet rest for 5 minutes before serving.
5 min
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