Ingredients
1 c all-purpose flour1/2 t baking soda
1/8 t salt
1/2 c, plus 1 T unsweetened cocoa powder (we used Ghirardelli)
2/3 c sugar
1/3 c dark brown sugar
5 T unsalted butter
1/3 c plain, fat-free yogurt
1 egg, beaten
1 t vanilla extract
1 T balsamic vinegar
Description

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