Preheat your oven to 350°F (175°C). Line a 15x10 inch baking sheet with parchment paper, extending over edges and lightly grease it.
In a large mixing bowl, whisk eggs and granulated sugar on high speed for about 5 minutes until thick and pale. Stir in brewed coffee or water and 1 teaspoon vanilla extract.
Sift together cocoa powder, salt, baking powder, and flour in another bowl. Gradually fold dry ingredients into egg mixture until just combined, preserving airiness.
Pour batter into prepared baking sheet, spreading evenly. Bake for 12-15 minutes until cake springs back when lightly touched.
Remove cake from oven and immediately dust top with powdered sugar. Place a clean kitchen towel over cake and gently roll it up from the short end. Let cool completely in rolled position.
While cake cools, whip 1 cup heavy whipping cream, 4 tablespoons powdered sugar, and peppermint extract until stiff peaks form. Add green food coloring and mini chocolate chips, folding gently.
Once cake is cool, gently unroll and remove parchment paper. Spread mint cream filling evenly over cake, leaving a small border on all sides.
Carefully roll cake back up without towel. Wrap in plastic wrap and refrigerate for at least 1 hour to set filling.
Remove plastic wrap and transfer cake roll to serving platter. Optionally dust with powdered sugar and garnish with additional mini chocolate chips. Slice and serve.