Preparation-
Preheat oven to 350 degrees
Combine cracker crumbs with brown sugar
Lay a sheet of foil in a 8 x 8 square baking pan, with the sides overhanging the edges
Tuck sides under
Spray foil-lined base with butter-favored cooking spray
Press crumb mixture into pan
Briefly spray cooking spray on top, and press again
In a medium bowl, beat light cream cheese until softened
Add lime zest and condensed milk
Beat until smooth
Add lime juice and beat until well blended
Pour lime mixture on to crumb base
Bake for 25-30 minutes, until center is just set and edges pull away a little
Allow to cool
Chill for at least 2 hours
Cut into 16 bars