Place flour in a microwave safe dish and heat for 50 seconds. Check to ensure it reached 160 degrees. If not, heat for 20 more seconds and check again.
Chop candy bars into chip size pieces and set aside.
Cream together butter and sugars. Add vanilla and mix again. Add salt and baking soda, and mix until incorporated. Add milk and beat.
1/2 cup unsalted butter, 1/2 cup brown sugar, 1/4 cup granulated sugar, 1 teaspoon vanilla, 1/4 teaspoon salt, pinch baking soda, 1 1/2 teaspoons milk
Scrape down bowl, then mix again. Add flour and stir until just about mixed, then add chopped candy bars.
1 cup flour, 1 cup candy bars
Store in the fridge or freezer in a tightly sealed container. This tastes best after it rests for an hour.