Over medium-high heat, cook till the mixture reaches 285F, stirring often. In practice, this means that you cook it until it’s a good toffee color. Really, keep stirring throughout the process. Pull it off heat, mix in the bacon bits, (sometimes I add unsalted, shelled peanuts) and pour onto the baking sheet. Spread quickly to about 1/4” thick, and let cool for 2 hours.
Using a hammer or the handle of a large knife, break the toffee into shards. This is best accomplished by whacking it through a folded paper towel.