In a bowl add in the room temperature soft butter and the powdered sugar. Beat well with a whisk or hand blender until the butter becomes creamy and they are combined. Now add in the vanilla extract and beat again until well combined.
In another bowel sieve together all purpose flour and salt . Now add the creamed butter and sugar mixture. Mix together and knead to a soft dough. Now add in the funfetti sprinkles and mix again .
Now cover the dough in a plastic wrap and refrigerate for about 1 hour. Remove from the fridge and roll the dough using a rolling pin to a uniform thickness about ¼ inch. Now cut into desired shape using a cookie cutter. If the cookie cutter is sticky dip in flour and then cut into desired shapes.
Collect the scrapes and repeat the process until all the flour have been used to cut into desired shapes. Meanwhile preheat the oven in 180 deg C for about 10 min. Line cookie tray with parchment paper.
Place the cookies and bake in 180 deg C for about 10-12 mins or till the edges of the cookie turn golden brown. Once baked cool them in a wire rack. The cookie may appear soft when they come out of the oven but become crisp when they cool down.