Streusel-Topped Key Lime Squares

Ingredients

• 0.8 teaspoon double-acting baking powder 
• 0.3 cup butter softened
• 3 large eggs 
• 1 cup flour all-purpose
• 3 tablespoons flour all-purpose
• 0.3 cup granulated sugar 
• 0.7 cup granulated sugar 
• 0.1 teaspoon lemon extract 
• 0.5 cup key lime juice fresh
• 1 teaspoon lime rind grated
• 1 tablespoon powdered sugar 
• 0.1 teaspoon salt 

Equipment

• bowl
• frying pan
• oven
• knife
• whisk
• wire rack
• blender
• baking pan
• measuring cup

Directions

1. Preheat oven to 35
2. Place first 5 ingredients in a medium bowl; beat with a mixer at medium speed until creamy (about 2 minutes). Lightly spoon 1 cup flour into a dry measuring cup; level with a knife. Gradually add 1 cup flour to butter mixture, beating at low speed until mixture resembles coarse meal. 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.
3. Bake at 350 for 12 minutes or until just beginning to brown.
4. Combine 2/3 cup sugar, 3 tablespoons flour, baking powder, and 1/8 teaspoon salt in a medium bowl, stirring with a whisk.
5. Add lime juice and eggs, stirring with a whisk until smooth.
6. Pour mixture over crust.
7. Bake at 350 for 12 minutes.
8. Remove pan from oven (do not turn oven off); sprinkle remaining 2/3 cup flour mixture evenly over egg mixture.
9. Bake an additional 8 to 10 minutes or until set.
10. Remove from oven; cool in pan on a wire rack.
11. Sprinkle evenly with powdered sugar.