1/2 cup butter
2 cups firmly packed brown sugar
1 cup light corn syrup
1 (14-ounce) can sweetened condensed milk
1 teaspoon vanilla
Melt butter in 2-quart saucepan; add brown sugar, corn syrup and salt. Cook over medium
heat, stirring occasionally, until mixture comes to a full boil (10 to 12 minutes). Stir in sweetened condensed milk. Continue cooking, stirring occasionally, until small amount of mixture dropped into ice water forms a firm ball or candy thermometer reaches 250°F (25 to 30 minutes). Remove from heat; stir in vanilla. Pour into prepared dish. Let cool completely. Remove from dish using parchment, and cut into sqares.
Recipe adapted from Land O' Lakes.