Grease 4 microwave-safe teacups with butter. Put the milk in a microwave-safe bowl and microwave on high until very hot, 1 to 2 minutes. Steep the tea bag in the hot milk, about 4 minutes. Remove the tea bag and whisk in the sugar, oil, egg, lemon juice and vanilla until smooth, about 2 minutes. Whisk in the flour, baking soda and salt. Pour into the prepared teacups until they are about two-thirds full. Microwave, one at a time, until puffed and a toothpick comes out clean, about 2 minutes; let cool slightly. Top with whipped cream and cinnamon.
Courtesy of Food Network Magazine, Photograph by Ryan Dausch