Generate a recipe for making a vanilla milkshake.

Vanilla Milkshake Recipe

Ingredients:
- 2 scoops vanilla ice cream
- 1 cup milk
- 1 teaspoon vanilla extract
- Whipped cream (optional)
- Sprinkles or cherry to garnish (optional)

Directions: 
1. In a blender, combine the vanilla ice cream, milk and vanilla extract. 
2. Blend the ingredients together until smooth.
3. If you prefer your milkshake to be thicker, you can add more ice cream or use less milk. You can also thin it out by using more milk.
4. Pour the mixture into a glass and top with whipped cream and garnish with sprinkles or a cherry if desired.
5. Serve and enjoy!
This recipe makes one serving.