SPREAD cookies, pretzels and raisins into 13x9-inch rectangle on lightly greased baking sheet; set aside.
PLACE chocolate in small heavy saucepan; cook on very low heat until completely melted, stirring constantly. Drizzle over cookie mixture; spread with spatula to evenly coat all ingredients. Top with candy corn and sprinkles; lightly press into chocolate mixture to secure.
COOL until firm, then break into pieces. Store in airtight container at room temperature.