Beat the cream cheese and butter together until smooth with no lumps, about 2 minutes.
Sift in the cocoa powder and powdered sugar; beat until the mixture is a deep, even brown with no pale streaks.
Add the vanilla and salt; mix until combined.
Add the heavy cream one tablespoon at a time, beating after each addition, until the dip falls off the spoon in a slow ribbon rather than a stiff lump.
Fold in the mini chocolate chips by hand.
Cover and chill for 20 minutes so it firms up enough to hold a strawberry without sliding off.
Scoop into a serving bowl and serve right away with strawberries and pretzel sticks.
Good to Know
If strawberries are out of season, swap in banana slices tossed with a little lemon juice to stop the browning.