Step 1

Prep. Preheat oven to 375 or (350 convection).  Prepare two baking sheets by lining with parchment paper.

Step 2

Wet ingredients. Cream butter, shortening, and sugar in stand mixer for about 3 minutes, until creamy and fluffy.  Scrape down sides and combine again. Add egg and vanilla, mix on medium until combine.

Step 3

Dry ingredients. Combine the flour, salt, baking soda, and baking powder in a separate mixing bowl.  On low speed, slowly add the flour mixture to butter mixture until combined.

Step 4

Shape. Roll into tablespoon-sized balls and place on parchment lined baking sheets. (Dough will be soft.) Gently flatten with a glass.  Sprinkle with colored sugar. (Alternatively, roll in sugar before baking for sugar on both sides.)

Step 5

Bake. Bake 11-13 minutes, or until set.  They will be light in color but the edges should be starting to turn golden. Store in cookie jar up to 3 days or freeze fully baked up to 1 month.