Butter Toffee

Directions

1. 1
   Line a baking sheet with parchment or waxed paper.
2. 2
   Combine the butter, granulated sugar, brown sugar and heavy cream in a medium heavy saucepan and cook over low heat, stirring occasionally, until the sugar dissolves.
3. 3
   Continue to cook until the mixture reaches 300 degrees F, or the hard-crack stage (a drop of boiling syrup immersed in cold water crackles).
4. 4
   Remove from the heat, add the vanilla, and stir.
5. 5
   Pour onto the prepared sheet and let cool completely.
6. 6
   Crack the toffee into large shards with a rolling pin.
7. 7
   Place the pieces in a large deep pot and break into smaller pieces with the end of the rolling pin.
8. 8
   Store in an airtight container until ready to use.