Add the ice cream, milk, and any mix-ins to your blender.
Blend for 1 -2 minutes.
Drizzle the inside of your glass with a sauce, if desired.
Pour the milkshake into your glass.
Top with any whipped cream or toppings as desired.
Notes
Add up to ½ cup milk total into the milkshake to create your desired thickness. Do not add too much milk, or else the milkshake will become too runny over time.