Combine 1 cup flour, butter, pecans, and 1/4 cup sugar in a bowl.

Mix until the mixture is crumbly using a pastry blender.

Press the crumbly mixture into a greased and floured 12x8 inch baking pan.

Bake the crust at 350°F (175°C) for 15 minutes.

In a separate bowl, beat eggs with a fork.

Add lime juice, 1 cup sugar, 2 tablespoons flour, and baking powder to the beaten eggs.

Mix the egg mixture well.

Pour the lime mixture over the pre-baked crust.

Bake the lime squares for an additional 25 minutes.

Remove from oven and let it cool completely.

Sprinkle with powdered sugar before serving, if desired.

Cut into squares and serve.