Preheat the oven to 325°F (165°C) and grease a loaf pan, lining it with parchment paper for easy removal.
Whisk almond flour, cocoa powder, baking powder, salt, and powdered sweetener until evenly combined.
Add melted butter, eggs, almond milk, and vanilla, then stir until the batter is smooth and thick.
Pour the batter into the prepared pan and smooth the top.
Bake for 50 to 55 minutes until set and a toothpick comes out mostly clean.
Cool in the pan for 15 minutes, then transfer to a rack to cool completely.
Melt sugar-free chocolate chips with heavy cream and drizzle over the cooled cake if desired.