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1
To prepare crust: Preheat oven to 350.
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2
Coat bottom of 8-inch square baking pan with cooking spray.
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3
Place flour and powdered sugar in bowl of food processor.
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4
Add butter.
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5
Pulse machine on and off until mixture resembles coarse meal.
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6
(By hand, place flour and sugar in mixing bowl; add butter.
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7
Cut butter into dry ingredients using pastry blender or 2 table knives.)
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8
Remove mixture from processor; knead gently until dough holds together and forms solid mass.
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9
Press dough evenly into prepared pan.
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10
Bake on center rack until crust is lightly colored, 15-18 minutes.
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11
Remove from oven; retain oven temperature.
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12
To prepare filling: Beat eggs in mixer on medium speed 1 to 2 minutes.
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13
Add sugar, flour and baking powder; beat 1 minute at high speed.
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14
Stir in lime zest and juice.
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15
Pour mixture over baked crust and spread evenly with spatula.
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16
Return pan to oven and bake until top is light brown and center is set, 20-25 minutes.
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17
Sprinkle pistachios over top, pressing them down so they adhere well.
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18
Let cool completely in pan.
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19
Using long, heavy, sharp knife, cut into 16 squares.
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20
If not using immediately, arrange squares on plate and cover with plastic wrap.
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21
(Bars can be prepared 1 day ahead).
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22
Serve bars cold or at room temperature.
