One day, Minnie bakes cookies for Mickey's birthday, but her dog, Fifi, accidentally knocks popcorn into her batter while chasing a fly. Minnie, none the wiser, puts the batter in the oven. Minnie then prepares for the visit, as does Fifi. Mickey and Pluto then arrive. Minnie accepts Mickey's flowers while playing the grand piano, but Fifi rejects Pluto's bone. Minnie has baked the cookies too long, burning them. Mickey smells the smoke and Minnie, suddenly remembering her cookies, runs into the kitchen. As she takes them out, the popcorn starts popping, but not before Pluto eats one, leading to him having an exploding cookie stuck in his belly while Mickey fights the burnt cookies with a water sprayer (with water filled from Minnie's goldfish bowl)