Cut each avocado in half lengthwise. Remove the pit from the avocado and discard. Remove the avocado from the skin, and place the avocado flesh in a bowl. Using a fork, smash until chunky.

Using a vegetable peeler, remove the skin of the mango. Using a sharp knife, slice the wide flat part of the fruit off one side of the pit. Repeat this process for the other side of the mango. Transfer the mango slices to a cutting board and cut into 1/2-inch pieces.

Add the mango, cilantro, red onion, chile, lime juice, salt and pepper to the bowl. Fold the ingredients into the guacamole. Taste and add more salt and pepper if desired. Serve immediately with tortilla chips.