This is the recipe from Tori Ritchie's site online which is the author of The Art of Blending. All kinds of recipes there. http://www.tuesdayrecipe.com/tuesday-recipe-archives/desserts/vegan-chocolate-mousse/
Vegan Chocolate Mousse

Like all things made with chocolate, the better the quality, the better the result, so use a top-notch brand like Callebaut or Guittard. To chill the coconut milk, put the can in the fridge when you bring it home from the store then scoop out the rich creamy stuff right from under the lid.

serves 4
prep time: 15 minutes
chill time: at least 2 hours
1 pound silken tofu
6 ounces top-quality bittersweet chocolate, chopped
1/4 cup chilled unsweetened coconut milk (not light)
3 tablespoons real maple syrup
1 teaspoon vanilla
1/4 teaspoon almond extract
pinch sea salt
sliced almonds or chocolate shavings for garnish, optional
Remove tofu from package and place on a paper-towel lined plate to drain. Melt chocolate in a metal bowl set over a pan of barely simmering water; do not let bottom of bowl touch water. Scrape melted chocolate into Vitamix container (or food processor bowl with the metal blade); add drained tofu, coconut milk, maple syrup, vanilla, almond extract, and pinch sea salt. For blender, put lid on securely, turn dial to 1, and start blender. Increase speed to 5 and blend for 15 seconds. Remove lid and scrape down sides of container then cover and increase speed to 8 and blend again for 30 seconds to aerate mixture. If using a food processor, put lid on blend for about 1 minute.
Divide among ramekins or small cups, filling each about 3/4 full. Cover and refrigerate until set, at least 2 hours or overnight. Top with sliced almonds or chocolate shavings if you want, or serve unadorned like I did and dig right in.
They also have this recipe on Amazon if you search The Art of Blending Cookbook there is an image of the page with the recipe. Could not copy & paste from there since it's a photo.