Preheat the oven to 350 degree F. Insert liners into a medium cupcake pan.
In a large bowl cream together the butter, milk, and vanilla with an electric mixer until fluffy, about 3-5 minutes.
In a separate bowl mix together the flour, baking powder, and salt.
Add the dry ingredients to butter mixture. Mix until integrated. Stir in the sugar. With an electric mixer on low speed, beat for 30 seconds. Turn the mixer up to mediuk speed and beat for 2 minutes. Add the egg whites. Beat for 2 more minutes. Stir in the crushed cookies.
Fill the cupcake liners 3/4 full. Bake for about 20 minutes or until a toothpick inserted in the center of cupcakes comes out clean. cool cupcakes in the pan.
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