Wash the chicory, cut out the stalk in a wedge shape, and cut the chicory into 2 cm wide strips.
Heat the butter or oil in a saucepan over medium heat. Add the diced onion and cook for 3 minutes until softened.
Cut the chicken breast fillets into 1 cm wide strips. Add to the saucepan and cook over medium-high heat for 4-5 minutes, stirring occasionally, until cooked through (internal temperature 74°C / 165°F). Add the chicory strips and cook for 3 minutes.
Season with the curry powder, soy sauce, salt and pepper. Remove from heat and fold in the whipped cream. Serve with broad pasta or rice.