In large bowl, combine crushed cookies and margarine. Mix well. Press lightly in bottom of ungreased 9x13-inch pan. Cut ice cream into 1-inch thick slices. Place over crushed cookies. Spread ice cream with spatula to cover completely. Sprinkle with peanuts. Cover. Freeze. In a medium saucepan, combine powdered sugar, chocoalte chips, evaporated milk and margarine. Bring to a boil over medium-low heat. Cook 8 minutes, stirring constantly. Remove from heat. Stir in vanilla. Cool 1 hour. Pour topping over ice cream filling. Cover. Freeze. Let stand at room temperature a few minutes before servings.