PREHEAT oven to 350°F. Mix graham crumbs, sugar and baking powder in large bowl; set aside. Beat egg, milk and honey with wire whisk until well blended. Add to graham mixture; stir just until moistened. Stir in 1 cup of the graham snacks.
SPOON batter evenly into 12 medium muffin cups sprayed with cooking spray. Toss remaining 1/2 cup graham snacks with the marshmallows. Sprinkle evenly over batter; press lightly into batter.
BAKE 16 to 20 min. or until toothpick inserted in centers comes out clean. Let stand 5 min. in pan; remove from pan to wire racks. Cool slightly.