PREHEAT oven to 350°F. Line 15x10x1-inch baking pan with foil. Place graham squares, with sides touching, in single layer in baking pan; top evenly with the crushed candy.
BAKE 6 min. or until candy is melted; sprinkle with the chocolate chips. Bake an additional 2 to 3 min. or until chocolate is melted.
SPREAD chocolate over topped grahams with spatula; sprinkle with pecans. Cool completely. Break into pieces. Store in airtight container at room temperature.