Puree the remaining ingredients with a hand blender to make a patty. The capers are only mixed in after they have been pureed. 3/4 of the paste is poured into the chicken breast fillets. Then the filled chicken breast fillets are placed in the oven at 180 ° for half an hour. Then the rest of the paste is spread onto the chicken breast fillets and everything is briefly pushed into the oven until the paste is slightly golden brown.