Key Lime Bars

Directions

1. 1
   Preheat oven to 350; position oven rack in middle of oven; spray a 13 x 9 inch metal baking pan with cooking spray.
2. 2
   Reserve 1 tablespoon cake mix; set aside.
3. 3
   In a big bowl, add remaining cake mix, melted butter, and egg yolk; blend 1-2 minutes using an electric mixer on low speed until well blended and crumbly.
4. 4
   Press mixture into bottom of prepared pan; bake 15 minutes.
5. 5
   While crust bakes, in a big bowl, whisk the eggs, condensed milk, lime juice, and reserved cake mix until blended and smooth.
6. 6
   Stir in lime zest; carefully spread mixture over warm base layer.
7. 7
   Bake an additional 20-24 minutes or until topping is set and golden brown.
8. 8
   Transfer to a wire rack and cool completely.
9. 9
   Refrigerate until cold before serving, at least 2 hours; cut into bars.
10. 10
    *Creamy Lemon Barsprepare as directed but use lemon juice in place of lime juice and lemon zest in place of lime zest.
11. 11
    *Orange Burst Barsprepare as directed but use 1/2 cup orange juice plus 2 1/2 tablespoons lemon juice in place of lime juice and orange zest in place of lime zest.