Frozen Mint Cookie Brownie Bars

So I needed a St. Patty's Day themed recipe and saw this one in pinterest, http://www.ourbestbites.com/2012/03/mint-chip-ice-cream-brownie-squares/.  But of course, I made some changes to cut out steps, adjust to my taste and even remove some fat.  Very minimal skill required, but does require some time to freeze in between steps.
Ingredients:

• 1.5 quart of mint cookies 'n cream frozen yogurt (the original recipe called for mint choc chip ice cream but I liked this better- plus the Turkey Hill brand was on sale)
• 1 box Ghiradelli Chocolate Supreme Brownie Mix  (or any other good box kind that's for a 9x9 pan)
• 1, 8 oz tub Cool Whip (I used lite)
• 20 mint Oreos (the original recipe called for regular oreos, but then adds peppermint extract, but I thought this would be a better way to cut out that step).

Here we go:

1. Make brownies according to directions on box in a 9x13 pan lined with foil (the box calls for 9x9 but you want it to be a thinner layer than normal brownies).  Bake until slightly underdone to keep them chewy. (I checked them at 10 min less than the suggested 9x9 time, then continued to cook them 5 more min.) Cool on counter.

2. Put a 1.5 quart of mint cookies 'n cream ice cream on the counter on a plate, stirring every 10 minutes to evenly thaw. Put Cool Whip in 'fridge to thaw.

3. When brownies are cool and fro yo is melted (should be like frosting consistency), spread an even layer of the fro yo over brownies.  Cover with plastic wrap, then foil and place FLAT in the freezer for a few hours.  (I had mine slanted at first and it wasn't pretty :)

4. Remove frozen deliciousness from freezer, and spread Cool Whip over minty layer. 

5. Crush (but don't polverize) Mint Oreos in zip lock bag into about 1/4 Oreo pieces- you want to maintain the green filling color.  Evenly sprinkle Oreos on top.  Cover with plastic wrap then foil again, and place back into the freezer for at least 1-2 more hours.

5. Remove from freezer about 10 minutes before serving.  Pull up masterpiece from pan using foil lining and (easier with a friend's help) remove foil, dropping back into 9x13 pan.  Cut up and serve!