Makes about 3 dozen cookies depending on size, with extra truffles

For the espresso truffles:
1/2 cup heavy cream
1 (10 ounce) bag bittersweet chocolate chips
2 tablespoons Kahlua liqueur
1 teaspoon espresso powder

For the peanut butter cookies:
1 1/2 cups all-purpose flour
1 teaspoon baking soda
1/2 teaspoon salt
1 stick (4 ounces) unsalted butter, softened
3/4 cup creamy peanut butter
1/3 cup granulated sugar
1/3 cup packed dark brown sugar
1 large egg
2 tablespoons milk
1 teaspoon pure vanilla extract
Cane or turbinado sugar, for dipping
Chocolate espresso truffles (recipe above)