Line a 9x13-inch baking pan with parchment paper or spray with nonstick baking spray. Set aside.
In a bowl (or the bowl of a stand mixer), sift together 2 1/2 cups all purpose flour, 2/3 cups powdered sugar and 1/2 teaspoon salt.
Then add 12 Tablespoons unsalted butter, melted and mix until combined.
Put the crust dough into the lined pan and press into a flat thin layer with the bottom of a measuring cup.
Bake for about 20 minutes, until a light golden color around the edges.
Lime Filling
In a food processor or stand mixer, add in 3 cups granulated sugar and 3 Tablespoons lime zest. Mix until the zest is fully incorporated.
Add remaining half cup of flour to the sugar mixture and pulse again.
Add 1 cup fresh lime juice, 8 large eggs and 6 drops green food coloring, and mix until completely combined.
Pour the filling over the crust and place in oven. Bake for about 30-40 minutes, turning the pan after 15 minutes. Check for doneness by wiggling the pan. If it doesn’t jiggle in the middle, it’s done. Do not overbake.
Remove from the oven and allow to cool for about an hour before chilling in the refrigerator. Then chill for at least two hours.
When ready, dust heavily with 1/4 cup powdered sugar and then cut into 16 bars. Optional: Sprinkle the tops with additional lime zest.
Then enjoy!
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.