In the base of a stand mixer or with a hand mixer, cream together butter, shortening, and sugar for 1 minute on medium high speed until well combined
Add in the molasses and egg and mix on medium high speed for 1 minute until well combined
Add in dry ingredients and pulse the mixer until just combined
Chill dough for at least 2 hours
Scoop chilled dough into balls and roll them in sugar. We flatten them very slightly. Bake at 375 degrees F for 15 minutes (for cookies that are about 2.5 oz)