1Butter 8-inch square (2-quart) glass baking dish. In large microwavable bowl, microwave butter and marshmallows uncovered on High 1 minute 30 seconds, stirring after 1 minute, until smooth. Stir in cereal until coated. Press about 4 cups mixture firmly in pan. Spread yogurt over top.
2Mix dried peaches and remaining cereal mixture (if cereal mixture has become firm, microwave uncovered on High 30 seconds to soften). Spread over top of yogurt; press firmly with dampened hands. Refrigerate until firm, about 30 minutes.
3For bars, cut into 4 rows by 3 rows. Store covered in refrigerator.