Place baking sheet on bottom rack of oven. Fill halfway with water. Heat oven to 325 F. Line 9-by-13-inch pan with foil and spray with nonstick spray.

 

Using food processor, pulse cookies until crumbly. Stir together crumbs and butter. Press evenly into bottom of prepared pan.

 

Beat cream cheese until creamy. Add sugar and sour cream, and beat again until smooth. Add key lime juice, zest and flour, and beat until mixed thoroughly. Add eggs, one at a time, and beat gently after each. Add green food coloring to cheesecake mixture, if desired.

 

Spread cheesecake batter evenly over crust in pan. Add 1 cup of blueberry pie filling over top of cheesecake. Use butter knife to gently swirl pie filling into cheesecake. Do not let knife go through to crust.

 

Place pan on oven rack above tray of water. Bake 45-48 minutes. Remove immediately and place on wire rack for 1 hour then place in refrigerator until completely chilled.

 

Cut into 24 squares and serve with whipped topping, remaining pie filling and key lime wedges.

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