Roll each piecrust into a 12-in.
square; cut each square into 24 pieces.
Shape into balls, and press into lightly greased miniature muffin pans.
Melt butter in a large skillet over medium heat.
Add onions and parsley; saut until onions are tender.
Add spinach; cook 2 minutes.
Stir in Worcestershire sauce, salt, and pepper.
Remove from heat.
Whisk together eggs and milk until blended; stir in cheese.
Add egg mixture to spinach mixture; spoon evenly into prepared pans.
Bake at 350 degrees for 30 to 35 minutes.
Remove immediately from pans, and cool on wire racks.
Freeze quiches up to 2 months.
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