Into a food processor, add almonds, cocoa powder, sugar, cinnamon and chocolate chips. Pulse until finely ground.
Into a bowl add the egg whites and cream of tartar. Beat on high speed until thick and fluffy. Add the almond mixture to the egg whites along with Vanilla extract. Fold the mixture in until well combined.
Preheat the oven to 375℉.
Remove the dough from the refrigerator. Spray the mini tart molds well with nonstick spray. You can also use a mini cupcake pan. Cut a small piece and add the piece to the tart mold. Using your fingers press the dough into the mold to form a tart shell. Repeat this will all the molds.
Using a 1 inch cookie scoop, scoop the filling into the tarts. Place on a baking sheet and bake at 375℉ for 15-18 mins.
Remove from the oven, allow to cool and pop out of the molds. They should come right out! Sprinkle with powdered sugar and enjoy!