Microwave – Place the chocolate chips in a microwave-safe bowl. Microwave for 60 seconds, then use a clean and dry spatula to stir well; continue to microwave the chocolate in 20 second intervals, pausing to stir well. Once the chocolate is 80% melted, remove from the microwave and stir with the spatula until completely melted.
Double-Boiler – Fill a sauce pan or small pot with 1 to 2″ of water, then place a glass bowl over the top and add the chocolate chips. Bring the water to a boil over high-heat, then reduce to medium-low heat. Allow the heat from the bowl to melt the chocolate, using a clean and dry spatula to stir well. Continue warming the chocolate until it is 80% melted, then carefully remove the bowl from the pot. Stir with the spatula until completely melted.
Make the Filling: While the chocolate is melting, add the silken tofu, non-dairy milk, coffee, vanilla, and salt to the same food processor (no need to rinse!). Process until the tofu has broken down and a smooth, uniform “batter” forms. Add the melted chocolate into the food processor, then blend together until everything is evenly incorporated – the mixture will be thick and glossy, and you may need to scrape the sides down with a spatula. Transfer the chocolate filling into the pan and use a spatula to spread it around evenly. I like to make a swirled design, but a rustic pie tastes just as great ;)
Chill: Place the tart into the fridge for at least 4 hours (up to overnight) to let the chocolate filling to set. You can also place the tart in the freezer for 2 hours for a faster chill time.
Serve: remove from the fridge, slice, and serve as desired; leftovers will keep covered in the fridge for up to 5 days, or can be pre-sliced and frozen for up to two months. If you freeze, let the slices thaw and come to room temperature before serving.