BUN: Take a hole-less doughnut (solid and round, no hole in the middle) and slice it in half, top and bottom.
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MEAT: Bake brownies, and cut them into rounds with a drinking glass or biscuit cutter. Make sure the rounds are close to the same size as the doughnut/bun.
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CONDIMENTS: For ketchup and mustard, use either colored cake icing or different colors/flavors of jam or fruit curd, and pipe it on in thin lines.Â
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LETTUCE AND TOMATO: Green cupcake sprinkles, then a slice of red-orange fruit leather or marzipan colored to look like tomato. Or else use slices of dried strawberries.Â
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FRENCH FRIES: Sweet potato fries, sprinkled with sugar and cinnamon rather than salt; fried apple chips; or thin wafter-and-cream cookies. Bonus points for cake icing 'ketchup'.
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PICKLE: No burger meal is complete without a pickle on the side. Use a candied cucumber or watermelon rind, or a slice of honeydew melon.
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Voila: Birthday treat! If you're concerned about the high amount of sugar in this "meal," make it in miniature by starting with a doughnut hole as the bun, instead of a full-sized doughnut.