I use miniature muffin pans for these, but you can use regular ones.
Ingredients
1 (3 ounce) package cream cheese
1/2 cup butter, softened
1 cup all-purpose flour
Steps

1. Combine cream cheese and butter in a small bowl; stir until smooth.
2. Add flour, mixing well.
3. Chill dough about 1 hour; roll into 24 (1-inch) balls.
4. Place in well-greased miniature muffin tins, shaping each into a shell.
5. Bake in 325° F oven for 10 -15 minutes or until they are lightly browned.  Don't over bake!
6. Let cool then remove from muffin tins with a knife. 
7. Fill with sweet or savory fillings.

OR
Before baking - fill shells with fillings to be baked, such a pie filling, quiche filling, etc.   Then:

1. Bake in 325° F oven for 20 -25 minutes or until they are lightly browned.  Don't over bake!
2. Let cool then remove from muffin tins with a knife.