Another slow start resulted in another lopsided loss for the Palo Alto High football team.

Archbishop Mitty built a 21-0 lead at halftime and went on to a 42-6 victory Friday night at Foothill College.

“We’re going to have to realize one of these days that our self-inflicted wounds give the teams we’re playing big leads,’’ Palo Alto coach Danny Sullivan said. “We’re not built to come back from 21-0 down.’’

A week ago in Mitty’s 30-23 win over Menlo-Atherton sophomore quarterback Shamir Bey ran for four touchdowns. Palo Alto did a good job of shutting down the quarterback run, limiting Bey to 32 yards on 10 carries.

“But we made him look like Joe Montana,’’ Sullivan said.

Bey threw three touchdown passes in the first half to Joseph Vaughn.

The Monarchs drove for a touchdown -- a 31-yard run by James Thomas -- on their first possession of the third quarter to make the score 28-0.

Palo Alto (0-3) responded with a 15-play, 80-yard scoring drive. Jackson Chryst, who completed only one pass in the first half, was 4-of-4 on the drive and hooked up with Bryant Jefferson on a 6-yard touchdown pass.

Paly’s defense forced a three-and-out and the offense took over with a chance to make a game out of it. Chryst hit Paul Thie with a couple of short passes, but the Mitty pass rush started teeing off on Chryst and sacked him three times on that possession, resulting in Paly turning the ball over on downs. Chryst was sacked six times in all.

Mitty (2-1) then went in for another TD to put the game away.

Palo Alto played without Paul Jackson III, the team’s leading offensive threat, who was out with a hamstring injury. Aiden Chang filled in and gained 62 yards on 18 carries.

“He’s not the biggest kid and he gets banged up,’’ Sullivan said. “But he doesn’t care about his body.’’

Mitty outgained Palo Alto 390-135.