This is an uncomplicated, very creamy quiche. The garlic is nice even without being sauteed. Cooked vegetables, seafood, or meat may be used in place of or in addition to the leeks.
Sprinkle cheese on bottom of pie shell. Saute leeks in butter until soft. Layer leeks evenly over cheese. In saucepan, bring creams and seasonings to boil. Beat eggs and mix in hot cream, beating constantly. Pour mixture into pie shell. Bake at 375 degrees F for 40 minutes, or until a knife inserted into the center comes out clean.