Roll the pie crust into a 13-1/2 in. circle. Fit into the bottom and up the sides of an ungreased 9-in. springform pan. Lightly prick the bottom. Bake at 450° for 8-10 minutes or until lightly browned. Cool slightly.
In a large bowl, beat cream cheese until fluffy. Add eggs and milk; beat until smooth. Add cheese, onions, bacon, salt, pepper and cayenne; mix well. Pour into the crust.
Bake at 350° for 40-45 minutes or until a knife inserted near the center comes out clean. Cool 20 minutes. Remove sides of pan. Cut into thin slices; serve warm.