Preheat oven to 350°.
Combine crust ingredients and mix well.
Press into the bottom of a greased 9x13 inch baking pan.
Bake for 20 minutes until the crust begins to turn a light brown.
Remove pan from oven.
Beat filling ingredients together in a medium sized bowl.
Pour over warm crust.
Return to oven, and bake for an additional 15-20 minutes until filling is set and slightly brown around the edges.
Remove from oven and cool for 10-15 minutes.
Sprinkle generously with powdered sugar.
Use a butter knife to loosen lemon bars from the edges of the pan.
Let cool completely.
Cut bars and remove from pan.