Here's a video that shows you how to make them:
Makes 8-10 cookie sandwiches
4 ounces unsalted butter, softened
½ cup sugar
2 cups flour
16-20 hard candies
¼ cup white chocolate, melted
# Make sugar cookies. In a medium bowl, mix softened butter and sugar until smooth. Add the egg and stir well to combine. Sift in the flour and fold until fully incorporated.
# Cover the dough with plastic and rest in a fridge for at least 30 minutes.
# Preheat the oven to 350˚F/180˚C.
# Sprinkle flour on the work surface and rolling pin so the dough won’t stick. Roll out the dough to ¼- to ⅛-inch thickness. Using a 3-inch round cookie cutter, cut out the dough. Cut out center of each cookie with using a 2-inch round cookie cutter.
# Place the cookie on a parchment-lined baking sheet and bake for 10 minutes.
# Take out the sheet from the oven and place hard candies in the center of each cookies. Bake for 3-5 minutes or until the hard candy melts and spreads out. Let the cookies cool completely.
# In a microwave-safe bowl, melt the white chocolate, about 10-15 seconds.
# In one cookie, add your favorite sprinkles onto the hard candy. Take another cookie and drizzle melted chocolate around the rim. Immediately sandwich the 2 cookies and set in fridge for 15 minutes.