Mac n Cheese Bar

Kosher salt and freshly ground black pepper

 ounces small elbow macaroni 

 tablespoons unsalted butter, plus more for greasing the baking dish 

 small onion, finely chopped 

 teaspoon cayenne pepper 

teaspoon sweet paprika 

 teaspoon ground nutmeg 

 cup all-purpose flour 

 cups whole milk 

ounces Brie, rind removed 

ounces Gruyere, shredded 

panko breadcrumbs 

grated Parmesan 

Kale chips

Hot dogs, cut into bite-sized rounds 

Chopped cooked bacon

Peas 

Ketchup 

Hot sauce 

Everything bagel seasoning 

Chopped roasted red bell peppers

Ranch dressing