In large microwavable bowl, microwave baking chips, shortening and peanut butter uncovered on High 1 minute to 1 minute 30 seconds, stirring once, until chips can be stirred smooth. Add pie crust squares, peanuts and toffee bits; stir gently until evenly coated. Immediately drop by heaping tablespoonfuls onto lined cookie sheets. (If mixture gets too thick, microwave on High 15 seconds; stir.) Refrigerate about 15 minutes or until set. Store covered.