Step 1

Grease a 9 inch square pan with butter. Line the bottom of the pan with mint oreos in an even layer.  Chop the remaining leftover oreos and set aside.

Step 2

Prepare brownie batter according to directions on package. Pour brownie batter on top of oreos and bake until done. The brownies are done when a toothpick comes out with just a few moist crumbs.

Step 3

Add andes mints on top and spread in an even layer. Return to oven for 2 minutes to melt a little. Remove from oven and use a knife to spread them evenly.

Step 4

Sprinkle mint oreos over the top of the andes mints and let cool completely, about an hour.

Step 5

Slice and serve or store in an airtight container for up to a week.