Pre-heat oven to 375F degrees.
In a large bowl whisk the eggs, add in milk, 1/2 cup cheese, dijon mustard, cream cheese (of choice) and ground pepper. Whisk to combine. Set aside.
In a separate bowl add in salmon, onion, capers (if using), kale and cherry tomatoes. Mix to combine. Set aside
Place a layer of brioche bread on the bottom of the casserole. Make sure to cover the entire bottom of casserole with loose cubes of brioche but don't press it down.
Pour half of the egg mixture on to the brioche.
Add in all the salmon and veggies. Make sure to distribute evenly.
Top with remaining egg mixture.
Fishish with remaining shredded cheese.
Bake for 40-45 minutes. Check the center to make sure it is cooked through. Cheese should be bubbly but egg cooked all the way.
Garnish with fresh greens, chives or dill, fresh ground black pepper and serve.