Preheat oven to 350 degrees F.
Place softened butter, powdered sugar, and vanilla in a bowl and beat together until light and fluffy, at least one minute.
Add the salt and one cup of flour and mix until combined. Add the other cup of flour and mix until dough just comes together - it will be a bit crumbly at first but it will come together. Once it starts holding together, stop mixing and use your hands to gently squeeze the dough until it comes into a ball.
Scoop out dough and roll into 1 inch balls. That's just over a tablespoon of dough per ball - I use my standard size cookie dough scoop and underfill it slightly.
Roll dough balls in sprinkles or colored sugar if desired. Place on ungreased cookie sheet (using a liner is fine). Flatten balls just slightly.
Bake for 13-15 minutes until edge of cookie feels set. Remove from oven and immediately place a Hershey's kiss in the center of each cookie, pressing down until cookie cracks around the edges.
Remove from cookie sheet and cool completely before serving.