Heat oven to 350 degrees. Line 8 square baking pan with foil; spray foil with cooking spray.
To make crust - Heat chocolate mint chips and butter in medium saucepan over medium low heat until melted, stirring constantly. Remove from heat; stir in cookie crumbs. Press into bottom of pan.
Bake 6-8 minutes or until fragrant. Cool competely on wire rack.
To make filling - Heat 1/2 c chocolate mint chips and 1 T butter in small saucepan over medium low heat until melted, stirring constantly. Remove from heat; cool to room termperature.
Beat remaining 1/4 c butter and cream cheese in large bowl at medium speed until smooth. Beat in 2 T cream and peppermint extract and vanilla. Reduce speed to low; beat in cooled chocolate mixture. Slowly beat in powdered sugar. Stir in remaining 1/4 c chocolate mint chips. Spread over crust; smooth top. Refrigerate 15 minutes or until set.
To make topping - Meanwhile, place chopped chocolate in medium bowl. Bring cream to a boil in small saucepan over medium heat; pour over chocolate. Let stand 1 minute; stir until smooth. Cool at room temperature 3-5 minutes or until slightly thickened but still pourable. Spread over filling; sprinkle with peppermint candies. Refrigerate 1 hour our until set. Store in refrigerator.