Well, this recipe didn't turn quite as green as I'd have liked, but they'd still make an amazing St. Patrick's Day dessert. I took my trusty Lemon Bar Recipe and made this key lime version. If you really wanted them to be more green just add some food coloring.
Key Lime Bars
1 c. (2 sticks) regular salted butter, softened
1/2 c. powdered sugar + more for garnish
2 c. flour
1 c. sugar
juice and zest from 2 limes
1/3 c. sour cream
Heat oven to 350 F. Combine butter, powdered sugar, and flour in a mixing bowl.
Press into a greased and lined 11x9" pan. (You could also use a 9x9" if you want super thick bars.)
Bake crust at 350 F for 18-20 minutes and cool for about 5 minutes. Meanwhile prepare filling by whisking together the remaining ingredients in a bowl. When crust has cooled for a few minutes, pour filling over crust. Bake for another 20-25 minutes.
Let bars cool completely, then remove bars from pan and sprinkle with additional powdered sugar.
Cut into squares.
They are so dang good. Enjoy!