In a medium bowl, scramble the eggs with the milk, goat cheese, shallot, mustard and salt. Pour the egg mixture into the prepared baking pan, tug up the sides of the parchment paper if necessary, and carefully slide it onto the middle rack of the oven. Bake for 10 minutes.
Preheat oven to 400 degrees Fahrenheit. Line a 9-inch square baking pan with two strips of parchment paper, cut to size (see photos and note above).