Molasses Peanut Brittle

1 cup unsulphered molasses
1 cup sugar
1 Tbsp. butter
1/4 tsp. baking soda
2 cups chopped peanuts

Combine molasses, sugar and butter in a 2-quart saucepan. Place over low heat; stir until sugar is dissolved. Cook over medium heat until syrup reaches 270 degrees on a candy thermometer. Remove from heat, stir in baking soda and nuts. Turn into greased 8-inch square pan; spread quickly. When slightly cool, cut into squares.