1. Unwrap KELLOGG'S RICE KRISPIES TREATS Original bars. Set aside. 2. In small saucepan combine brown sugar, butter and half-and-half. Cook over medium-high heat, stirring frequently, until mixture comes to full boil over the entire surface. Reduce heat to medium-low. Cook, without stirring, for 1 minute. Remove from heat. Whisk in powdered sugar and pecans. 3. Quickly spread over bars*. Cool completely.
*Note: If topping hardens too quickly, stir in a few drops of hot water and microwave for 10 to 30 seconds, stirring every 10 seconds.