In a medium bowl, beat cream cheese until creamy. Beat in eggs, milk and red pepper.
Squeeze spinach until almost dry. Stir spinach and ham or onion into egg mixture.
Pour into a frozen pie crust. Season with salt and pepper, to desired taste.
Bake in a preheated 350°F oven on a preheated baking sheet for 40-50 minutes, or until a knife inserted in center comes out clean.
Makes 6 servings.
Variation: Top quiche with tomatoes and sprigs of fresh basil, if desired, for added color.