Begin with 1 cup of cold full-fat milk. It provides the milkshake with a rich, creamy foundation that mixes well without ice.
Melt ½ cup of chocolate and cool it briefly. Mix with the milk to achieve that velvety, rich consistency.
Put in one full scoop of vanilla or chocolate ice cream. It adds creaminess and a rich, dessert texture to the shake.
Taste the mixture before putting in sugar. If necessary, add 1–2 teaspoons of sugar or honey and give it a few quick whisks.
Pour over ice in a cold glass and top with whipped cream, chocolate shavings, or a drizzle of syrup for that final decadent touch.