Combine almond milk, cocoa powder, sweetener, and salt in a small saucepan. Heat over medium until it begins to simmer, then taste and adjust sweetness.
Prepare a slurry by dissolving konjac, arrowroot, or xanthan gum in a little water. Whisk this mixture into the hot chocolate and cook until it thickens to your liking.
Alternatively, blend all ingredients (including chia seeds) in a high-speed blender until smooth. Reheat if necessary.
Serve hot with whipped cream and keto marshmallows for extra indulgence.
Notes
Feel free to adjust the sweetener to your taste. For a creamier texture, blend all ingredients in a high-speed blender.