The Godolphin four-year-old had produced a sensational performance to win the Met Mile by 14 lengths on his previous outing and he showed that effort was not a one-off by justifying odds-on favouritism against a field that included Grade 1 winners Effinex and Noble Bird.
Sent straight into the lead by Rosario, Frosted demonstrated his extraordinary talent by putting his rivals under pressure with some taxing early fractions and he maintained the gallop without his rider needing to ask for maximum effort.
"I knew he probably went a little too fast but I was cruising the whole way," Rosario said. "Sometimes he's a little difficult, and you have to let him do what he wants to do, but when I turned for home I knew I had something left because I know the way he likes to run."
Breeders' Cup bid
The Whitney Stakes is a designated 'win and you're in' race for the Breeders' Cup Classic and a trip to Santa Anita is on the cards for Frosted, according to trainer McLaughlin.
"It's a privilege to have him in the barn," the trainer said. "He is a special horse, great-minded, very talented. I hope one day I can say he's the best horse I've ever trained.
"Invasor was the best, but he is creeping up and if he can go on and win the Breeders' Cup or Dubai World Cup, he'll be right there with him or pass him."
Frosted could finish only seventh behind American Pharoah in last year's Breeders' Cup Classic but looks to have improved this season and only Dubai World Cup winner California Chrome is shorter in the ante-post betting.
Frosted can be backed at a top price of 6-1 with Ladbrokes for the Classic.
Also on Saturday
Mountaineer: West Virginia Derby (Grade 2) 1m1f, dirt, 3yo
Three weeks after landing the Indiana Derby, Coolmore's Cupid (Bob Baffert/Rafael Bejarano) picked up another lucrative Grade 2 prize with a dominant victory in this $750,000 event.
Saratoga: Test Stakes (Grade 1) 7f, dirt, 3yo
A massive upset here as 55-1 shot Paola Queen (Gustavo Delgado/Luis Saez) rallies from off the pace to secure a first US Grade 1 success for his Venezuelan trainer. "I'm a grown man, and I cry," said an emotional Delgado after the $500,000 contest.
G3 - The Majordomo Hospitality Handicap Steeple Chase
G2 - Prix Raoul Balliere
G2 - Prix Ariste Hemard
G3 - Victress Stakes
G2 - Premier Trophy