IT’S EASY TO SEE why Isaac Mizrahi’s Instagram feed is everyone’s favorite cooking show right now. The renowned fashion designer/actor/singer/producer’s videos, shot in his Bridgehampton, N.Y., and Manhattan kitchens, showcase his warm personality as well as his sporadic screw-ups. “This is exactly how cooking shows should be!” one commenter gushed. “They are always too perfect and intimidating!”On any given “episode” of his highly entertaining one-man show, Mr. Mizrahi (@imisaacmizrahi) might welcome his “darlings” to cook along, or to peek inside his drawer full of ice cream scoops, or to compose a cocktail along with him while he watches “Jeopardy!”

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