Use whole milk for the richest, creamiest texture—lower-fat options work but may be thinner.
Peppermint extract strength varies by brand; taste and add more if needed, but go slow!
For a fluffier shake, use a food processor instead of a blender.
Make it ahead? Blend and store in freezer briefly, but it’s best fresh.
Customize: Skip food coloring for a natural look, or add spinach/banana for a "healthy" twist (though not classic).
Perfect for St. Patrick's Day or anytime you crave that minty fast-food nostalgia!