Preheat your oven to 375 degrees F. This initial step is crucial as it ensures your dip will bake evenly and become beautifully bubbly.
Grab a 10-inch cast iron skillet and toss together the plum tomatoes, red onion, jalapeño, red pepper, kosher salt, and black pepper. Use a wooden spoon to mix everything thoroughly, allowing the flavors to blend harmoniously.
Now, it’s time to layer on the cheeses. Start with the Fontina cheese, followed by the mozzarella, and finally the sharp cheddar. This combination will create a rich and creamy texture.
Place the skillet in the oven and bake for about 10 to 13 minutes. You’ll want to keep an eye on it; the goal is to have the cheeses melted and bubbling nicely.
Once it’s ready, carefully remove the skillet from the oven. The aroma will be irresistible! Sprinkle the dip with fresh cilantro, a squeeze of lime juice, and add the avocado on top.
Serve immediately with Tortilla chips. Enjoying this dip fresh from the oven is truly a treat!
