Line an 8-inch square pan with foil and smooth the surface. Spray the foil with coconut oil spray.
Combine the chocolate chips, sweetened condensed milk and chipotle and adobo in a double boiler over medium heat. Heat, stirring, until melted and smooth, 5 to 7 minutes.
Immediately pour the mixture into the foil-lined pan. Use an offset spatula to smooth the surface, then sprinkle it with sea salt. Refrigerate for at least 2 hours. Cut into small squares.