Dora's Dunking Donuts

Dora's Dunking Donuts (1933) starring Andy Clyde, Ethel Sykes, with Shirley Temple & Bud Jamison
Schoolteacher Andy Clyde is lovestruck by the lovely Dora (Ethel Sykes), and every morning buys a cup of coffee and four donuts at her bakery. And she reciprocates his feelings, though both are too shy to come out & say it.

The school children, including Shirley, can see it plainly. And when the opportunity comes up to make a radio commercial at Bud Jamison's radio station, things *seem* to go wrong …