Preheat an oven to 350ºF.
Line an oven-safe tray with aluminum foil and spread tortilla chips evenly across it.
Layer corn, jalapeños, onion, tomatoes and cheese over the chips.
Place the tray in the oven for 8–10 minutes.
In a large sauté pan over medium-high heat, add the butter and Tilapia. Cook on each side for 2 minutes, then reduce heat to medium and add chipotle sauce and lime juice.
Remove nachos from the oven and place cooked Tilapia pieces evenly on top. Spoon some of the butter from the sauté pan on top, if desired. Garnish with avocado.
Calories are per serving.