Preheat oven to 350. Insert liners into a medium cupcake pan.
In a large bowl cream together the sugar, butter, and eggs with an electric mixer on medium speed until fluffy, 3-5 minutes. Mix in the sour cream.
In a separate bowl mix together the flour, baking soda, cocoa, ground coffee, and salt.
In a measuring cup combine the coffee and vanilla.
Add the dry ingredients to the creamed mixture, alternating with the coffee mixture. Mix thoroughly.
Fill the cupcake liners 3/4 full. Bake for 20-25 minutes or until a toothpick inserted in the center of cupcakes comes out clean. Cool cupcakes in the pan.
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