[‘Do not over-blend the milkshake to avoid gritty texture; blend until creamy with small cookie flecks remaining.’, ‘Chill glasses before assembling to keep the milkshake colder longer and slow melting.’, ‘Layer crushed cookies and whipped cream gently to maintain tower structure.’, ‘Whip cream until stiff peaks form; avoid over-whipping to prevent grainy texture.’, ‘Use full-fat dairy for richest mouthfeel; avoid ultra-low-fat milks to prevent watery shake.’, ‘Assemble right before serving to prevent soggy cookies.’, ‘Wipe glass rims after each layer for a clean presentation.’, ‘If milkshake is too thick, add a splash of milk and blend briefly; if too thin, add more ice cream.’]