I got this following recipe from the Prodigy Bb...it's from Better Home & Gardens Quick & Easy Cookbook. I made it, and it was, as attested to by the original poster, Very good. I used traditional ingredients, but I'm sure one would get excellent results using low- fat versions for the cheese, and egg substitute for the eggs.

In a large skillet, cook ground beef, onion & thyme until meat is browned & onion is tender. Drain off fat. Stir together the 1 egg & 1/4 cup milk. Add bread crumbs, worcestershire sauce, salt & pepper. Mix well. Add meat mixture and mix well again. Press meat mixture into bottom of an 8" round baking pan. In a blender, combine the 3 eggs & 3 tbs milk. Cover & blend until smooth. With blender running, add cream cheese & cheddar cheese cubes through opening in lid. Blend until nearly smooth. Pour cheese mixture over the meat. Bake at 375 for 30-35 minutes or until the cheese mixture is puffy & set. Puff will remain creamy in center. Serve immediately.