In a mixing bowl, beat the butter and powdered sugar until light and fluffy.
Beat in the egg and vanilla until combined. Then add the flour and salt, continue to beat until combined.
Sprinkle in the jimmies and mix with a spoon.
Cover and chill the dough for about an hour in the refrigerator.
Take dough out of fridge. Scoop enough dough out to make about 1.5-inch ball. Roll out the ball with the palm of your hands until you have about an 8-inch rope. The thicker the rope the less chance of it to break. The jimmies cause it to break as well I noticed, so if that happens just pinch it back together.
Take the rope and crisscross it towards the bottom to make a circle then crisscross it again as you go up. Keep it tight. Leave the ends spread apart a bit, this will represent the bunny ears. Place on a parchment lined baking sheet.
Bake for 8-9 minutes. Remove from oven and let cool.
Add a dollop of frosting to the “butt” of the bunny and a jelly bean for the tail.