Heat a wok over high heat. Add 1 tbs oil and heat until hot. Add 1/2 the beef and stir-fry for 2-3 minutes or until evenly browned. Remove to a plate, cover loosely with foil and keep warm. Repeat using the remaining oil and beef.
Add the curry paste to the wok and stir-fry over high heat for 1 minute or until aromatic. Add the beef and stir to coat in the curry paste.
Add the coconut cream and mushrooms to the wok. Stir to combine and bring to the boil over high heat. Reduce the heat to medium-low and simmer for 5 minutes. Stir in the capsicum and cook, stirring constantly, for 1 minute.
To serve, spoon the curry into serving bowls and top with the coriander leaves and chopped roasted peanuts. Serve with steamed jasmine rice.