Molasses Sandwich Cookies with Coffee Cream

Name: Molasses Sandwich Cookies with Coffee Cream
Ingredients: 2 1/4 cups all-purpose flour; 1 Tbsp. finely ground coffee or espresso; 1 3/4 tsp. baking soda; 1 1/2 tsp. ground cinnamon; 1/2 tsp. ground ginger; 1/2 tsp. kosher salt; 1/4 tsp. ground allspice; 3/4 cup (1 1/2 sticks) unsalted butter, melted, cooled; 1/2 cup (packed) dark brown sugar; 1/4 cup mild-flavored (light) molasses; 3/4 cup granulated sugar, plus more for rolling; 1 large egg; 3 Tbsp. unsalted butter, cut into pieces; 8 oz. blond chocolate, such as Dulcey, or milk chocolate, divided; 3/4 cup heavy cream; 2 tsp. finely ground coffee or espresso; 1/2 tsp. vanilla extract; 1/4 tsp. kosher salt