Chai Oatmeal Lace Cookies

Name: Chai Oatmeal Lace Cookies
Prep time: 1 h
Total time: 1 h
Cuisine: American
Ingredients: 113 grams unsalted butter (1/2 cup; 1 stick); 225 grams dark brown sugar (1 cup + 2 tablespoons, packed); 16 grams all-purpose flour (2 tablespoons), sifted; 1/4 teaspoon ground cinnamon; 1/4 teaspoon kosher salt; 1 teaspoon vanilla extract; 1 large egg, at room temperature; 160 grams old-fashioned oats (1 1/2 cups; 5 2/3 ounces); 25 grams candied ginger, finely chopped (2 tablespoons); 4 chai tea bags; 160 milliliters whipping cream (2/3 cup), plus more for topping up; 160 grams dark chocolate (5 2/3 ounces, or about 1 cup); 15 grams unsalted butter, softened (1 tablespoon)