Article: You can do this with your fingertip, the back of a spoon, a fork, etc. Don't flatten the balls so much that they are flat like a pancake. If you are using a mint mold, simply push the ball into the mold, smooth down the back, and pop it out. If you are in a hurry, you can also leave them to harden in the fridge or freezer; this will only take about 2 hours.
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Flatten each ball slightly or push it into a mint mold. Transfer the mints to a sheet of wax paper or parchment paper and let them dry for a few hours.