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About Sibby

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Sibby Ross Thomsen founded Sibby’s Cupcakery in 2004 with the mission of providing joy and happiness to her customers and community. She began her baking career at age 4, making blueberry-peach pies with her mother in Topeka, Kansas. As an adult, she perfected her cupcake recipes on the side during a 10-year career in advertising, before she made the leap to pursue her passion for baking and decorating full-time.

Sibby serves on the board of the San Francisco Bakers Dozen, a non-profit organization for Bay Area baking professionals and enthusiasts.

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Our Story

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Called “the cupcake center of the universe” by the San Francisco Bay Guardian, Sibby’s Cupcakery has been featured in numerous local and national publications, including San Francisco Modern Bride, Daily Candy, and Lucky Magazine, which named it one of the best places for baked goods in Northern California. From 2015 to 2021, Sibby’s Cupcakery has been voted Best Party Food/Caterer on the Peninsula by the readers of Bay Area Parent magazine.

Awards & Accolades

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Voted Best Party Caterer 2015 - 2021. Hall of Fame Inductee 2017-2021.

~ Bay Area Parent Magazine


~ The Knot Best of 2010


"Perfectly adorable little cakes"

~ Modern Bride


"The tiered stands of colorful treats were as tempting as any classic cake ❲...❳"

~ The Knot


"Sibby's cupcakes are not your average fourth-grade-birthday-celebration cupcake. The frosting tops come in mouthwatering colors and the cake bottoms are equally decadent."

~ SF Bay Guardian


"The best-looking and best-tasting damned cupcakes you've dared to dream of."

~ SF Bay Guardian


"Custom-made cupcakes that dreams are made of."

~ Paper Magazine


"Cute-as-a-button-but-way-more-delicious cupcakes"

~ Daily Candy


"The cupcake center of the universe"

~ SF Bay Guardian


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