Lemon Squares

Mom has kept this notecard for over 20 years with the following list as the only instructions:

• 2 c flour
• 1 c margarine
• 1/2 c powdered sugar
• 1 tsp baking powder
• 1/2 tsp salt
• 4 eggs
• 6 tbsp lemon juice
• 2 c sugar
• 1 tbsp flour
  

Mother!

Here is my attempt to translate:

1. Grease a 9x11 pan with PAM
2. Mix the first five ingredients directly in the pan and press to form crust.
   
3. Bake 20 min. at 350
   
4. In a separate bowl, combine the remaining ingredients (extra lemon) and pour on top of crust (can be hot)
   
5. Bake another 20-25 min. at 350
   
6. Sprinkle with powdered sugar