Combine sugar and next 5 ingredients (sugar through salt) in a large saucepan; bring to a boil over medium-high heat. Cook 10 minutes or until sugar dissolves and candy thermometer registers 325°, stirring occasionally. Remove mixture from heat; stir in peanuts and remaining ingredients. (The baking soda will cause the mixture to bubble and become opaque.)
Quickly pour mixture into prepared pan, spreading to edges. Let stand 1 hour; break into pieces.
Note: Store the peanut brittle in an airtight container for up to 2 weeks.