Place all ingredients in a medium mixing bowl and smash together with the back of a spoon. Taste test it by adding a small amount to a piece of plain bread or cracker. Adjust seasoning as desired and do another taste test. To store, form into a log using plastic wrap and store in the freezer until ready to use.
If you need to quickly bring cold butter to room temperature, cut it into 1" pieces and place evenly on a dinner plate. Cook in the microwave in 30 second increments at 20% power. The butter should be soft to the touch but not runny.