For the base: Combine crumbs, melted butter and sugar; press tightly into the bottom of a 9-inch by 13-inch pan.

For the filling: Heat 1/4 cup butter, cream and colouring together in a large saucepan over medium heat. Add marshmallows and stir until melted. Add flavourings and pour over the base, spreading it evenly. Set aside to cool.

For the topping: Heat whipping cream over medium-high heat. Add chocolate and remove from heat; let chocolate melt entirely. (Return it to the stove briefly if you need a little more heat for melting.) Chocolate mixture should not be hot, just warm enough to be melted. Spread melted chocolate over the green filling and chill for at least 4 hours before cutting.
Yield: 24 small bars