Combine the brown sugar, garlic powder, onion powder, mango, and chipotle pepper in a food processor. Season with salt and pepper, then puree until smooth. Scrape the sauce into a bowl and add the pork, tossing to coat.
Thread 6 wooden skewers with alternating pieces of pineapple and pork.
Preheat a grill pan or outdoor grill to medium-high. Drizzle the skewers with oil and sprinkle with salt. Grill the skewers, rotating as needed and basting with any leftover mango sauce as you rotate, until the pork is cooked through and lightly charred at the edges, about 10 minutes. Serve hot.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.