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Unwrap the sticks of butter you're cutting in and set them on a cutting board. Then slice them into several -inch cubes to that they're a bit easier to mix in with the other ingredients. Add your butter cubes into a food processor with the other ingredients and quickly press and release the power button. Allow one second to go by and then press the button again. Press the button like this about 8 times to get the right consistency. Depending on what you're baking, you may want to combine the ingredients more extensively with your fingers. Otherwise, you may be able to keep adding ingredients to the food processor and continue mixing by pulsing. For example, all of your mixing can be done in the food processor if you're making a pie crust.
Cut chilled or frozen butter into -inch (1.3 cm) cubes. Pulse all ingredients about 8 times in a processor. Mix the butter in by hand or continue mixing in the food processor.