To celebrate the fifteen-dollar raise he has been awarded for successfully designing plans for the expansion of a radio station, clumsy draftsman Dagwood Bumstead buys an expensive new stove for his wife Blondie. A short time later, at the Henwick Country Club, Dagwood meets his boss, George Radcliffe, and J. T. Thorpe, the radio station owner, for a game of golf. On the golf course, Dagwood makes one blunder after another, causing Thorpe to leave in a huff, and Radcliffe to rescind Dagwood's raise. Convinced that Dagwood is inept, Thorpe tells board members of the Premier Biscuit Company, one of the station's advertisers, to expect a delay in the construction on his new station. Dagwood, meanwhile, returns home and sadly tells his family that he will not get a raise after all. Blondie, determined to keep her new stove, decides to earn the needed money herself by selling her homemade cookies to Llewellyn Simmons, an eccentric man she met at a grocery store. Unknown to Blondie, Simmons is actually the president of the Premier Biscuit Company. As Dagwood begins a correspondence course in radio engineering to make more money, Llewellyn and Blondie become fast friends and spend their days baking cookies together in Blondie's kitchen. One day, Dagwood bungles a repair attempt on Thorpe's radio and, as a result, is fired from his job at the construction company. Forced to rely on his new radio engineering skills to make a living, Dagwood assembles a device that is able to interrupt commercial radio broadcasts. When the device is accidentally activated during a Premier Biscuit commercial, Blondie's voice cuts in with a plug for her cookies and ruins Premier's advertisement. Consequently, Robert Dixon, the biscuit company's vice-president, decides to cancel his account with Thorpe's radio station and abandon his expansion contract with Radcliffe. Dixon orders an investigation into the disruption of his advertisement, soon after which two police officers arrive at the Bumsteads' to dismantle Dagwood's device. Blondie tries to explain to Thorpe and Dixon that the broadcast was an accident, but they refuse to believe her and insist on prosecuting her and Dagwood. Things look bad for the Bumsteads until Llewellyn arrives and explains that he was the one responsible for accidentally activating Dagwood's radio transmitter during Premier's advertisement. Upon realizing that Llewellyn is Blondie's cookie-baking partner, Dixon drops his charges and approves the expansion plans, and Radcliffe re-hires Dagwood with a raise and bonus.