Lay a sheet of foil across the top of each pan (not touching batter). The foil should keep the blondie dough from browning and keep the colors vibrant. Bake for 12 minutes covered in a glass baking pan or 22 minutes in a metal baking pan. Then remove the foil and complete baking for another 15 minutes or until the top is set. The top may appear a bit moist, but will firm as the brownies cool.
I recommend shipping Galaxy Brownies uncut for longer freshness. Wrap each entire square of brownies (removed from pan using the foil overhang) first in foil and then in plastic wrap. Then insert the wrapped brownies into a freezer weight gallon ziplock bag. Include a few plastic knives for cutting.