Cut each chicken breast into 2-3 pieces (either strips or squares). Coat each piece in flour, then egg, and then bread crumbs. Fry until crumbs are light-medium brown. (The inside does not really need to be cooked through so don't dry it out!)
Combine all sauce ingredients with an immersion blender until smooth.
Arrange shnitzel pieces in single layer in a baking pan, and pour the sauce over them. Cover with foil, and bake on 350 for 1 hour.