3 tbsp. margarine, softened
3 tbsp. fat-free cream cheese
1 1/2 cups sugar
1 large egg yolk
3/4 cups all-purpose flour
2 Tbsp. all-purpose flour
3 Tbsp. powdered sugar
1 large egg
1/4 cups fat-free egg substitute
1/3 cups fresh lime juice, from Key limes

Preheat oven to 350ºF. Coat an 8-inch square baking dish with cooking
spray. To make the crust, beat margarine, cream cheese and 1/2 cup of sugar
with
an electric mixer until light and fluffy. Beat in egg yolk and gradually
add 3/4 cup of flour. Spread into baking dish using your hands (coat hands
with 1 tablespoon of powdered sugar to prevent batter from sticking - or I
stick my hand
inside a plastic sandwich bag). Bake until crust is lightly browned, about
15 minutes.

To make the filling, beat egg and egg substitute in the same bowl used to
make crust. Add remaining 1
cup of sugar and 2 tablespoons of flour; beat on low speed until blended.
Add lime juice; beat on low speed until blended. Pour onto warm crust and
bake 15 minutes more. Cool on a rack. Sprinkle with 2 tablespoons powdered
sugar.