Heat your grill or grill pan to medium-high heat (about 400°F). Season both sides of the chicken breasts with salt and pepper. Grill for 6-7 minutes per side until golden with nice char marks and internal temp hits 165°F. Let it rest for 3 minutes before slicing into bite-sized pieces.

Toss the sliced grilled chicken with your BBQ sauce in a bowl until every piece gets coated. I always use about half the sauce here so it's flavorful but not drowning. Taste and add more sauce if you want it extra tangy — this is where you customize your crowd nachos.

Grab a large baking sheet or oven-safe platter and spread half your tortilla chips in a single layer. You'll build in two layers so everything gets crispy on top and warm underneath. Don't use a glass dish for this — trust me on the even heating.

Sprinkle half the cheddar cheese over the first layer of chips, then top with half the BBQ chicken. Add half your diced red onion, half the jalapeños, and half the cilantro. This distributes flavor throughout instead of clustering everything in one spot.

Add your second layer of chips on top, then cover with remaining cheese and BBQ chicken. Scatter the rest of your red onion, jalapeños, and cilantro over everything. This layering keeps your party nachos sharing balanced — every bite has multiple toppings.

Broil on high for 2-3 minutes until the cheese bubbles and gets a little golden on top. Keep your eye on it after minute 2 because broilers are aggressive. I accidentally left mine in for 4 minutes once and the chips got burnt, so watch it like a hawk this time.

Pull it out when the cheese is melted and bubbly, then top with dollops of sour cream and guacamole. Squeeze fresh lime juice over everything right before serving to brighten up all those rich flavors. Serve immediately while it's hot — your BBQ chicken nachos party recipe works best piping hot.