STIR 3/4 cup of the boiling water into 1 pkg. of the dry gelatin mix in medium bowl at least 2 min. until completely dissolved. Refrigerate 1 hour or until slightly thickened. Stir in yogurt and raspberries. Pour into 1-1/2-qt. serving bowl. Refrigerate 1-1/2 hours or until set but not firm.
MEANWHILE, drain peaches, reserving juice. Add enough cold water to reserved peach juice to measure 1 cup; set aside. Stir remaining 3/4 cup boiling water into remaining pkg. of gelatin in large bowl at least 2 min. until completely dissolved. Stir in reserved juice mixture. Refrigerate 1 hour or until slightly thickened.
RESERVE several peach slices for garnish. Chop remaining peaches; stir into thickened gelatin. Spoon over creamy layer in bowl. Refrigerate 3 hours or until firm. Top with the reserved peach slices just before serving. Garnish with fresh mint leaves, if desired.