Both sites feature a vending machine that dispenses Propercorn product, with approximately 15,000 packets to be handed out to members of the public over the almost two-week long campaign.
In addition, Propercorn will be be offering free screen-printing and nail makeovers between 11am and 7pm on 4 and 11 July at both locations.
Propercorn pelotons complete with the brand's product are also making their way around London, manned by brand representatives dressed in Propercorn t-shirts.
This latest activity forms part of a broader campaign involving set designer Rachel Thomas, who has created a series of installations for Propercorn, which include colourful graphics on London buses, tube stations, buildings and phone boxes.
The pop-ups will remain in operation until 12 July.