Line an 8x8" pan with foil or plastic wrap. If foil, grease with butter, oil, or bacon fat.
In medium saucepan, combine chocolate, milk, butter and cream. Cook over low heat until chocolate melts and is smooth. Remove from heat.
Crumble bacon, and reserve about 1/4 c. Stir bacon into chocolate mixture. Spoon into prepared pan, smooth with spatula.
Sprinkle reserved bacon over top of chocolate, and press down slightly.
Melt 1/2 c chocolate chips and 1/2 Tbsp butter. When smooth, drizzle overall. If desired, sprinkle lightly with course salt.
Cover, and chill for 4 hours. Cut into squares to serve.