Plantain Chip Nachos with Spicy Chicken

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2 tablespoons vegetable oil

1 white onion, diced

Kosher salt and freshly ground pepper

1 serrano chile pepper (1/2 minced, 1/2 sliced)

1 teaspoon chipotle chile powder

Grated zest of 1 lime, plus the juice of 2 limes

1 cup low-sodium chicken broth

1 rotisserie chicken, skin removed and meat shredded (about 4 cups)

1/2 mango, diced

1 beefsteak tomato, diced

1 cup chopped fresh cilantro

4 tablespoons unsalted butter

1/4 cup all-purpose flour

2 1/2 cups whole milk, warmed

1 8-ounce bag shredded Mexican cheese blend

3 5-ounce bags plantain chips

1 8-ounce container guacamole