This was not Hoover's actual slogan, but it was more or less the slogan used by a Republican ad during this campaign.
The idea behind this is that the Republicans would bring prosperity. They would make everyone wealthy enough to afford those things that they mentioned. (I've read that back then chicken was more expensive than beef.) So, Hoover ran on the idea that he would be able to bring continued prosperity to the American people.
This worked for Hoover because the economy had been going well under Harding and Coolidge and so people trusted the Republicans.