Instructions
1. Preheat and Prep Preheat your oven to 375°F. While the oven is heating, finely chop your sweet onions. The smaller the dice, the better the texture of the finished dip.
2. Mix the Base In a medium mixing bowl, combine the chopped onions, the mayonnaise, and 1.5 cups of the shredded Swiss cheese. Stir until the onions are thoroughly coated and the cheese is evenly distributed.
3. Layer the Skillet Transfer the mixture into a small cast-iron skillet or a shallow baking dish. Use a spatula to smooth the top into an even layer. Sprinkle the remaining 0.5 cup of Swiss cheese over the top to ensure a golden, bubbly crust.
4. Bake to Perfection Place the skillet in the oven and bake for 25 to 30 minutes. You are looking for the edges to be bubbling vigorously and the cheese on top to be beautifully browned and slightly crispy.
5. Serve Warm Remove from the oven and let it sit for about 5 minutes (if you can wait that long) to set. Serve it straight from the skillet with sturdy ruffled potato chips, toasted baguette slices, or fresh vegetable sticks.
Pro-Tips for Success
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The Skillet Matters: Using a cast-iron skillet helps retain heat, keeping the dip warm and gooey for much longer than a ceramic dish.
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Don’t Skimp on the Onion: It might seem like a lot of raw onion initially, but they soften and sweeten significantly during the roasting process.
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The “Golden” Rule: If you want an extra-browned top, pop it under the broiler for the last 60 seconds of cooking, but watch it closely so it doesn’t burn!
