CNBC's Jim Cramer interviews Kraft Heinz CEO Steve Cahillane about reviving long-slumping sales by reinventing old brands like Kraft Mac & Cheese, Philadelphia cream cheese, and Jell-O around growing demand for protein. Cahillane, who has put $700 million into the business and paused a planned company split, says a "forever brand" mentality was the company's mistake, and Kraft Heinz projects a return to growth in the second half of 2027.