I've been making these cookies for several years now and they are always a hit. I adapted the recipe from a Martha Stewart recipe....she used unsalted butter, then added salt, which I always think is silly. She also used corn syrup for the chocolate ganache which I think is unacceptable, you don't need to use corn syrup ever to make something delicious. Let me know what you think. A Votre Sante!
10 tablespoons (1¼ sticks) butter, divided
½ cup confectioners' sugar
1 teaspoon vanilla extract
1¼ cups unbleached flour
2 ounces semisweet chocolate (about 1/4 cup)
Preheat oven to 350 degrees F. In the bowl of an electric mixer fitted with a paddle attachment, beat together 1 stick of the butter, sugar, salt, and vanilla on medium-high speed until smooth, about 2 minutes. Beat in the flour, beginning on low speed and increasing to medium-high. Using a small cookie scoop or heaping teaspoons, roll the dough into balls, and place 1-inch apart on a baking sheet. Bake for 10 minutes, remove from oven, and make an indentation into the middle of each cookie. Return to oven, and bake until light brown on the edges, 7 to 9 minutes more. Remove to a wire rack to cool.
Combine chocolate, 2 tablespoons butter Set over a pot of simmering water; stir occasionally until melted and smooth. (Alternately, you can microwave the mixture on 50% power in 30-second increments, stirring after each, until completely melted and smooth.) Allow to cool slightly. When cookies are cool, fill the thumbprints with the chocolate mixture.
(Recipe adapted from Martha Stewart Living, December/January 1994/1995)