On a sheet pan place the walnuts and toast for 3-5 minutes or until the walnuts are fragrant and start to turn golden brown. Remove from the oven and set aside.
Pull the outermost 2 leaves from the endive heads, cut them into quarters, rinse and dry. Then set aside.
Slice the apples thinly removing the core. You can leave in larger pieces but I prefer matchstick sized slices.
In a bowl or platter layer the endive, arugula, walnuts, apple slices and goat cheese.
Top with the champagne vinaigrette and serve immediately.