Cream the butter and sugars. You want to make sure these are completely combined and the mixture is fluffy.
Add the dry ingredients To the sugar mixture add the dry ingredients. The mixture will be dry and crumbly.
Add the vanilla and the milk and mix till combined. The dough will look like a soft cookie dough.
Place the dough into the shape of a disc on plastic wrap and wrap it tight. Place it in the fridge for about an hour.
Cut the dough in half and place the half between two pieces of parchment paper. Roll the dough until it's about 1/16-⅛ in thick. At this point if the dough has become soft and the parchment is sticking, place it on a baking sheet and back into the freezer for about 15-20 minutes. Once frozen the parchment should release.
Repeat with the other half of the dough.
In a preheated 350 degree oven bake the cookies for 12-15 minutes. The cookies should look dull when they are done.
While the cookies bake, spread your desired ice cream into a flat layer. I like to line a baking sheet with plastic wrap, cover it and place it back into the freezer to set up.
Once the cookies are baked, let them chill and then place them into the freezer for at least 2 hours or longer until solid. This will help make it easier to assemble the ice cream sandwiches.
Cut and sandwich the ice cream sandwiches into desired shapes.
Chill again. Trust me these are best once the assembled ice cream sandwiches have been chilling for at least 4-6 hours.