Chocolate Malted Whopper Cookies

INGREDIENTS

• 1¾ cups all-purpose flour
• 1 cup malted milk powder
• ¼ cup unsweetened cocoa powder
• 1½ teaspoons baking powder
• ¼ teaspoon salt
• 1 stick plus 3 tablespoons (11 tablespoons) unsalted butter, at room temperature
• 2/3 cup granulated sugar
• 2 eggs
• 1 teaspoon vanilla extract
• ¼ cup whole milk
• 2 cups (6 ounces) chocolate-covered malted milk balls (Whoppers), coarsely chopped
• 1 cup chocolate chips (or 6 ounces chopped chocolate)