Blend butter and cream cheese. Stir in flour just until blended. Chill about 1 hour.

Preheat the oven to 325 degrees F (165 degrees C).

Shape dough into 24 1-inch balls and press into ungreased 1 1/2-inch muffin cups (mini-muffin size) to make a shallow shell.

Fill with your favorite filling and bake until shells are light brown, about 20 minutes.