Begin by preheating a skillet or griddle to medium heat (about 350°). While it heats, whisk together the flour, sugar, baking soda & powder, salt, and crushed cookies. Whisk in the egg and milk until fairly smooth (there will likely be some lumps from the cookies), and then pour the batter onto your skillet or griddle.
Cook the pancakes about 4-5 minutes, until the tops are bubbly, then flip and cook another 4-5 minutes on the other side. While the pancakes are cooking, use a hand mixer or stand mixer to whip together the cream cheese, heavy cream, sugar, and vanilla until fluffy, about 4-5 minutes. It will have the consistency of very thick whipped cream when it is finished.
Remove the cooked pancakes and place them on plates. Allow them to cool for 2-3 minutes before adding the topping so that it doesn't melt and slide off. Garnish with en extra cookies if desired.