Heat oven to 400ºF.
Process chickpeas, stuffing mix and curry powder in food processor or blender until blended.
Add egg; pulse just until blended. Spoon into large bowl. Add zucchini and mix well.
Shape chickpea mixture into 12 (2-1/2-inch) patties, using about 2 Tbsp. for each.
Place in single layer on baking sheet sprayed with cooking spray; spray with additional cooking spray.
Bake 5 min. on each side or until golden brown.
Meanwhile, chop 1/4 of the cucumber; place in medium bowl. Stir in sour cream and milk.
Slice remaining cucumber.
Fill pita halves with falafel patties, sliced cucumbers, tomatoes and sour cream mixture.