Creating Mexican Mocha Tiramisu Cups is a straightforward process. Just follow these steps:

1. Prepare Coffee Mixture: In a shallow dish, combine the cooled espresso, coffee liqueur (if using), ground cinnamon, and cayenne pepper. Stir well and set aside.

2. Make the Cream Mixture: In a mixing bowl, combine the mascarpone cheese, heavy whipping cream, powdered sugar, and vanilla extract. Beat until soft peaks form. This should take about 2-3 minutes.

3. Dip Ladyfingers: Quickly dip each ladyfinger into the coffee mixture, ensuring they are coated but not soaked. Place them in the bottom of serving cups or glasses.

4. Layer the Mixture: Spoon a layer of the mascarpone cream mixture over the ladyfingers, smoothing it out with a spatula.

5. Add Chocolate: Sprinkle a layer of grated Mexican chocolate over the cream layer.

6. Repeat Layers: Repeat the dipping, layering of the cream, and chocolate until you reach the top of the cups, finishing with a layer of cream.

7. Chill: Cover the cups with plastic wrap and refrigerate for at least 4 hours, or overnight for optimal flavor.

8. Prepare to Serve: Before serving, dust the top of each cup with cocoa powder and a sprinkle of ground cinnamon for garnish.