In the bowl of a stand mixer, combine the sweetened condensed milk, butter, 2 teaspoon peppermint baking emulsion and 3 cups of the powdered sugar. Mix on low speed until the mixture comes together.
Add an additional ½-1 cup of powdered sugar and mix. Repeat this until the peppermint filling is soft, pliable, and not to wet. The total amount of powdered sugar you need will vary. The peppermint filling should be the texture of playdough. Refrigerate the filling for about 10-15 minutes.
Making the Peppermint Patties
Use a small scoop or 2 teaspoon of filling and roll into a ball. Place on parchment lined sheet tray. Cover the ball with a little parchment paper and press down with a tart shaper or something that has a flat surface to create the disc. You want to make them around 2" in diameter and ¼" thick for the best results. Repeat until all the filling is used. Place the patties in the freezer and freeze for at least 30 minutes.
Melting & Dipping the Peppermint Patties
Place 2 cups of water in the inner pot of the Ninja Foodi. Place your double boiler pot on top or use the rack with a bowl in the high position. Turn the sear/sauté on high and let the water boil. When it starts to produce steam, turn the heat down to low-medium.
Add 12 ounces of each type of chocolate to a bowl or double boiler and let the steam gently melt the chocolate. You can add ½-1 Tablespoon of coconut oil if you think your chocolate is too thick.
Remove 1 tray of peppermint patties from the freezer at a time. They warm up fast, so only take the tray out that you are working on. Using a fork, place the patty on the tip and dip it into the chocolate. Allow the excess to drip off and then place the dipped chocolate on the parchment lined tray. Repeat for the entire tray. Place the tray in the fridge or freezer for 5 minutes and then remove and let sit on the counter or you can skip the chilling period and just let them set up on the counter. It just takes a little longer.
Repeat for all the trays. Let the dipped candy sit on the counter for a few hours. Then it is set and ready to serve! Enjoy!