Measure dry ingredients, flour, baking soda and baking powder into a medium bowl.
In a large bowl or the bowl of a stand mixer, beat butter, shortening and sugar on medium high for five minutes or until light and fluffy. Be sure to pause briefly at least twice to scrape down the sides of the bowl and the bottom of the bowl with a spatula.
Add vanilla extract and egg and beat for another minute until combined.
Add dry ingredients and mix until just combined. The dough will be somewhat thick.
No need to chill this dough.
Preheat oven to 350 degrees.
Pour sanding sugar into a bowl.
Using a cookie scoop, scoop one inch balls of dough and roll into the sanding sugar.
Place balls of dough on a parchment-lined baking sheet.
Once you have 12 balls of dough on the sheet, flatten each with the bottom of a glass.
Bake at 350 for 12 minutes or until the bottoms of the cookies are golden tan.
Let cool on a wire rack.