Time-Warp Lemon Squares

I have tried sooo many recipes for these (really, it's ridiculous), but thankfully I've finally found one:]. I was so worried after the first couple of tries with different recipes that it was going to be impossible to veganize these, but they're amazing. Like baked lemonade on a yummy crust. :o Seriously, I would sit and eat a whole batch of them if I could. And, to top everything off, they're pretty easy to make! Here's the recipe:

Serves: 16
Crust:
2 cups all purpose flour
1/2 cup + 2 tablespoons margarine (I use Smart Balance light, but Earthbalance works just fine)
1/2 cup granulated sugar

Filling:
2 + 1/4 cups granulated sugar
9 tablespoons all purpose flour ( or 1/2 cup + 1 tablespoon)
3 teaspoon vanilla
1 + 1/2 teaspoons baking powder
3/8 teaspoon salt
zest and juice of six fresh lemons (you can use the pre-bottled juice if necessary)
Yellow food coloring (optional)

Topping:
powdered sugar (optional)

Preheat oven to 350 degrees.
Blend the margarine and sugar together until creamy. Add the flour and mix until you get a slightly crumbly consistency. Firmly press into an 8 x 8 inch pan. Bake for 15 min.
While the crust is baking, sift together the sugar, flour, baking powder, salt, and lemon zest (make sure to only zest the yellow of the lemon, don't get too much of the white or they will have a slightly bitter taste). Add the vanilla and lemon juice and incorporate well. Stir in a few drops of food coloring if using. Pour mixture over the crust, and bake 20 minutes more, or until set.
After you take them out, let them cool completely before cutting them (you can even chill them in the fridge).
Sprinkle powdered sugar on top just before serving[:

**Tip: These taste even better after letting them sit overnight!**