Combine first 3 ingredients in a large glass bowl. Microwave on HIGH 5 minutes, add peanuts, and microwave 2 more minutes with 1,000-watt microwave. Microwave 4 more minutes if using a 700-watt microwave. Stir in remaining ingredients.
Pour into a buttered 15- x 10-inch jellyroll pan; shake pan to spread thinly. Cool until firm, and break into pieces. Store in an airtight container.