Sandwich Cookies with Chocolate Ganache Filling

Heat oven to 350°F. Cut dough in half; roll out both halves to an even 1/4-inch thickness. Cut out cookies with a round 1-inch cookie cutter, rerolling scraps to get 72 cookies. Coat 2 cookie sheets with cooking spray; place cookies on sheets 1 inch apart and bake 1 batch at a time until firm, 3 to 5 minutes. Cool on wire racks. Simmer chocolate chips and half-and-half in a small saucepan over low heat, stirring once or twice, until chocolate melts and is smooth, 1 to 2 minutes; remove from heat. Let cool 1 minute. Spread 1/2 teaspoon chocolate ganache on a cookie; press a second cookie on top to form a sandwich. Repeat with remaining cookies and ganache.