Preheat oven to 375°. Cream butter and sugar in a large bowl until light and fluffy, 5-7 minutes. Beat in egg and extract. Combine flour, cocoa powder, salt and baking soda; gradually add to creamed mixture and mix well.

Drop by tablespoonfuls 2 in. apart onto greased baking sheets. Bake until tops are cracked, 10-12 minutes. Remove to wire racks to cool completely.

In a microwave, melt chocolate chips; stir until smooth. Drop a teaspoonful of marshmallow creme into the center of each cookie. Dip half of each cookie into melted chocolate; allow excess to drip off. Immediately sprinkle with candies. Place on waxed paper and let stand until set. Store in an airtight container.