Add brown sugar and butter to a 3-quart heavy-duty sauce pan.
1 Cup Light Brown Sugar, 1 Cup Unsalted Butter
Begin heating over medium-high heat. Stir slowly and constantly until the mixture begins to boil and all the butter has melted.
Stop stirring and insert a candy thermometer into pan. The thermometer should not touch the bottom of the pan.
Lower heat to medium and continue heating until the mixture reaches 300℉ (148° C). Do not stir.
Immediately remove pan from stovetop and pour into prepared pan. Use extreme caution while doing this as the mixture is hot enough to cause severe burns.
Sprinkle chocolate pieces evenly over the hot toffee and let melt for a few minutes. Using an offset spatula, carefully smooth the melted chocolate.
1 Cup Bittersweet chocolate chips
Wait 20 minutes for toffee to cool slightly. Evenly add sprinkles over top of melted chocolate.
½ Cup Sprinkles
Place two white candy melts for each snowman on top of sprinkles (one for the head and one for the body).
½ Cup White candy melts
Let toffee rest for 12 hours at room temperature before unmolding. If desired, toffee may be placed in a freezer for 30 minutes to set faster.
To unmold, gently pull up on parchment or foil extending over sides of pan. Remove paper (or foil) and place toffee on a cutting board.