2 cups vanilla ice cream
1 cup milk
2 to 3 tablespoons chocolate syrup
1 tablespoon cocoa powder
1/2 teaspoon vanilla extract
Add the ice cream, milk, chocolate syrup, cocoa powder, and vanilla extract to a blender
Blend until smooth and creamy
Add more milk for a thinner shake
Add more ice cream for a thicker shake
Pour into a glass
Serve immediately