Preheat the oven to 350°F and line an 8x8 inch baking pan with parchment paper, leaving an overhang. Mix the almond flour, cocoa powder, powdered sweetener, salt and melted butter, press firmly into the pan and bake for 10 minutes. Reduce the oven to 325°F.
Beat the cream cheese and powdered sweetener until smooth. Mix in the sour cream, peppermint extract, vanilla and green food coloring until the filling is an even pale mint color.
Add the eggs one at a time on low speed just until combined, then fold in the mini chocolate chips.
Pour the mint filling over the chocolate crust and bake for 28 to 32 minutes, until the edges are set and the center still jiggles slightly. Cool at room temperature for 1 hour.
Heat the heavy cream until steaming, pour it over the dark chocolate chips and let it sit for 2 minutes, then stir until glossy and smooth.
Spread the chocolate over the cooled cheesecake and sprinkle with the remaining mini chocolate chips.
Chill for at least 4 hours, then lift out using the parchment and slice into 16 bars.