Streusel-Topped Key Lime Squares

From Cooking Light (June 2005).

• Ready In: 55 mins
• Serves: 16

Ingredients

• CRUST

• 1⁄4 cup butter, softened
• 1⁄4 cup sugar
• 1  teaspoon  grated lime rind
• 1⁄8 teaspoon salt
• 1⁄8 teaspoon  lemon extract
• 1  cup flour
•  cooking spray

• FILLING

• 2⁄3 cup sugar
• 3  tablespoons all-purpose flour
• 3⁄4 teaspoon baking powder
• 1⁄8 teaspoon salt
• 1⁄2 cup  fresh key lime juice
• 3  eggs
• 1  tablespoon powdered sugar

Directions

1. Preheat oven to 350°F.
2. CRUST:.
3. Place first 5 ingredients in a medium bowl; beat with a mixer at medium speed until creamy (about 2 minutes).
4. Gradually add 1 cup flour to butter mixture, beating at low speed until mixture resembles coarse meal.
5. Gently press two-thirds of mixture (about 1 1/3 cups) into bottom of an 8-inch square baking pan coated with cooking spray; set remaining 2/3 cup flour mixture aside.
6. Bake for 12 minutes or until just beginning to brown.
7. FILLING:.
8. Combine 2/3 cup sugar, 3 tablespoons flour, baking powder, and 1/8 teaspoon salt in a medium bowl, stirring with a whisk.
9. Add lime juice and eggs, stirring with a whisk until smooth.
10. Pour mixture over crust.
11. Bake for 12 minutes.
12. Remove pan from oven (do not turn oven off); sprinkle remaining 2/3 cup flour mixture evenly over egg mixture.
13. Bake an additional 8 to 10 minutes or until set.
14. Remove from oven; cool in pan on a wire rack.
15. Sprinkle evenly with powdered sugar.