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1
Set aside 1 cookie for later use.
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2
Process the remaining cookies and chocolate in a food processor until they form a crumb mixture.
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3
Add the butter and process until the mixture starts to clump together.
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4
Press the mixture into a high-sided fluted tart pan, making a smooth base and sides with your hands or the back of a spoon.
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5
Put it into the refrigerator to chill and harden.
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6
Melt the marshmallows in a saucepan over low gentle heat along with the milk.
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7
Once the milk starts to foam (not boil), take off the heat and keep stirring until the marshmallows blend into the milk to make a smooth mixture.
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8
Pour the mixture out of the saucepan into a heatproof bowl, then whisk in the creme de menthe and creme de cacao.
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9
Leave until cool.
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10
In a medium bowl, whisk the cream until it starts to hold soft peaks then, still whisking, add the cooled marshmallow mixture.
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11
This filling should be thick but still soft, not stiff or dry, so that it will eventually drop easily out of the bowl into the chilled pie crust.
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12
When the marshmallow mixture and cream are combined, whisk in a few drops of food coloring, if desired.
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13
Spread the filling into the chilled base, swirling it about with an icing spatula or silicone spatula to fill evenly.
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14
Put the pie in the refrigerator, covered, to chill overnight or for a minimum of 4 hours until firm.
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15
Crush the remaining cookie and sprinkle it over the top of the pie before serving.
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16
Make Ahead Note:
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17
The pie can be made 1 to 2 days ahead.
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18
When chilled and firm, tent with aluminum foil (try not to touch surface with foil as it will leave marks) and store in the refrigerator.
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19
Decorate just before serving.
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20
The pie will keep 3 to 4 days total.
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21
Freeze Note:
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22
The pie can be frozen for up to 3 months.
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23
Open-freeze undecorated pie just until solid, then wrap the pie (still in its tart pan) in a double layer of plastic wrap and a layer of foil.
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24
To thaw, unwrap the pie and tent with foil (try not to touch surface with foil as it will leave marks), then thaw overnight in the refrigerator.
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25
Decorate before serving.
