Measure out all dry ingredients into a large bowl: sugar, cocoa powder, powdered milk, cornstarch, and salt. Add any extra flavor components like grated chocolate or spices too.

Thoroughly combine everything with a wire whisk or electric mixer until uniformly blended into a fine powder. Break up any clumps.

Transfer the mix to an airtight container like a mason jar or sealed plastic tub. Label jar with contents and date.

Store in a cool dry place for up to 1 year until ready to use.

For each serving, spoon 2-3 tablespoons of dry cocoa mix into a mug or heat-proof glass.

Heat milk or water to piping hot or gently boiling. Pour liquid over mix to fill mug.

Vigorously stir or whisk the mix into the hot liquid for 30-60 seconds until fully dissolved with no lumps.

Top off your creation with fun additions like marshmallows, whipped cream, chocolate shavings or your other favorite garnishes.

Carefully enjoy piping hot, letting the steam warm your face. Be cautious of the hot liquid as you sip.

For an even richer, more decadent mug, increase the mix to 1 tablespoon per ounce of milk or water. Customize sweetness and chocolate intensity to your preferences.