Process cookies on high speed until they are evenly sized crumbs, approximately one minute.
Add butter to a small saucepan.
Over low heat, melt butter.
Remove blade from food processor bowl and pour in butter.
Stir together Oreo crumbs and butter until combined and no liquid remains.
Press Oreo crumb mixture into an even layer in the bottom and up sides of a 9″ tart pan with removable bottom. Place in freezer for 15 minutes.TIP: To insure that the crumb mixture is in an even layer, I like to use the bottom of a glass to gently press the mixture into the pan.
Prepare Microwave Chocolate Ganache per recipe instructions. Spread 1 cup of ganache into an even layer in center and up sides of crust.
Place in freezer for 10 minutes. Meanwhile, allow ice cream to soften at room temperature while ganache sets.
Spoon softened ice cream into center of tart crust over ganache and spread into an even layer.Cover tightly with plastic wrap and freeze for at least two hours or as long as overnight.TIP: Depending how how thick your layers of crust and ganache are, you might not use all of the ice cream.
Prior to serving, top tart with whipped topping.
Garnish top of tart with mint cookies, placing them vertically into the whipped topping at equal intervals.
Place chocolate curls into center of tart.TIP: Not sure how to make chocolate curls? No problem! Smaller curls can be made by simply using a vegetable peeler along the side of a chocolate bar. If you'd like to make larger curls like these, this tutorial is great.