Prepare cookie sheets by lining them with parchment paper.
Add room-temperature butter and sugar to a bowl and beat until creamy. (use a hand mixer or stand mixer fitted with the paddle attachment).
Add the egg and vanilla and continue beating atmedium speed.
Add 1/2 of the flour mixture and continue mixing, scraping down the sides of the bowl as needed.
Add the remaining flour and salt, and finish combining. Do not overmix! Stop when the flour is incorporated. The dough should come together into a soft ball that isn’t sticky.
Transfer the dough to a work surface and press the sugar cookie dough onto two flattened discs. Wrap well with plastic wrap or place in an airtight container and refrigerate for at least 1 hour or up to 2 days.
Use a rolling pin to roll the dough to a ¼ inch (6mm) thickness on a lightly floured surface. Use cookie cutters to cut out desired shapes. Place on a prepared baking sheet and bake cookies at 350F for 10-15 minutes until the edges of the cookies are just golden brown.
Remove cookies to a wire rack to completely cool before decorating. This part is so much fun! When cool, melt some semi-sweet chocolate chips to decorate, and use some sprinkles for fun! You may also wish to decorate them with your favorite royal icing recipe or my favorite easy icing.