I wanted to try something a little different than the standard fudges I have made in the past and chose Key Lime Fudge from blogger Shugary Sweets (http://www.shugarysweets.com/2011/08/key-lime-fudge.html)
The only variation that I made was to use Cinnamon Toast Crunch Cereal instead of graham crackers, used non-stick coating spray on the pan and I didn't press them in the fudge as I didn't want them to get soggy.
It was super simple and we loved how it turned out...it had a lime taste without being overpowering, sort of like a fresh breeze of summer of a chilly day.
Wash the limes, roll lightly on a table to help get the juice loose (optional), zest the limes on a zester or grater (I used a grater), cut in half and juice the limes.
On low heat (I heated mine on the 1 1/2 mark on my stove) melt the sweetened condensed milk and both packages of the white chocolate chips until smooth - it took 18 minutes on my stove.
Once smooth, turn off heat and add the lime juice and the lime zest; mix thoroughly.
Spray a pan - I used a 9x12, but if you wanted thicker pieces you could use a smaller pan or a larger pan (or more than one) if you wanted to have thinner pieces. Pour the fudge into the pan.
Crush up 1/2 cup or more of Cinnamon Toast Crunch or graham cracker topping (leftovers are fun to use as an ice cream topping).
Sprinkle topping on the fudge and let set until cool (I cooled my off in the refrigerator) and then cut into squares to serve.