Prepare the Crust: Preheat oven to 350°F. Coat a 13- x 9-inch baking pan with baking spray with flour. Pulse next 4 ingredients in a food processor until combined, 5 to 6 times. Add cold butter; pulse until coarse crumbs form, 6 to 7 times. Firmly press into bottom of prepared pan. Bake until light golden brown, about 25 minutes. Cool slightly, about 10 minutes.

Prepare the Filling: Whisk together first 4 ingredients in a bowl. Add next 6 ingredients; stir until smooth. Pour over Crust.

Bake at 350°F until set, about 25 minutes. Remove from oven; cool completely in pan, about 1 1⁄2 hours. Chill 1 hour. Slice into 32 bars. Garnish with shaved coconut.