Vegetable-oil cooking spray
3 cups all-purpose flour, plus more for dusting
1 1/4 cups (2 1/2 sticks) unsalted butter, room temperature
3/4 cup (6 ounces) cream cheese, room temperature
1 cup salted shelled pistachios, ground to a paste in a food processor
3 cups sugar
6 large eggs, room temperature
2 teaspoons pure vanilla extract
1 tablespoon coarse salt
3/4 cup coarsely chopped salted pistachios
Drippy Icing
1 1/2 cups unsalted pistachio slivers