Milkshake

Let 1 pint ice cream sit out at room temperature until starting to soften, 10 to 15 minutes

stick 2 tall drinking or milkshake glasses in there, or else chill the glasses in the refrigerator. This will ensure the milkshake stays cold as long as possible. Coarsely chop until you have 1/2 cup mix-ins of your choice, you want the pieces to be about 1/2-inch.

Layer the ingredients in a blender in this order: 2/3 cup milk, flavor boost if using, and softened ice cream. Don't put in any mix-ins yet!

Starting on the lowest speed and working your way up to medium speed, blend until the milkshake is smooth and pourable, about 1 minute. Stop the blender and scrape down the sides or stir as needed to keep things moving.