In a large skillet over medium heat, cook the ground beef until browned. Drain excess fat.
Add onion and garlic to the skillet and cook until the vegetables are softened.
Stir in tomato sauce, diced tomatoes, chili powder, cumin, paprika, cayenne pepper, salt, and pepper. Bring to a boil, then reduce heat and simmer for 20 minutes. Set aside.
Preheat oven to 350°F (180°C). Arrange tortilla chips on two large baking sheets in a single layer.
Top the chips with half of the shredded cheddar and Monterey Jack cheeses, evenly distributing pulled pork, firecracker chili, red onion, and jalapeno slices (if using). Sprinkle remaining cheese over the top.
Bake for 10 12 minutes or until cheese is melted and bubbly. Remove from oven and let cool slightly.
Serve immediately with sour cream, lime wedges, and chopped cilantro.
Chef’s Insight
To get the perfect melt on the cheese, place nachos under the broiler for 1-2 minutes after baking in the oven.
Notes
Don't skimp on the cheese; a generous layer will ensure a gooey, melted finish.