Preheat the oven to 400 degrees F. Peel the potatoes and cut them into thick wedges, about 1.2" thick. The size of your potatoes will determine the length of the wedges, just do the best you can. Having equal thickness is more important than equal length.
Place them into a 17x10" baking dish, and toss in the chicken broth, olive oil, lemon juice, garlic, dried oregano, and salt. Mix everything together, then place the baking dish in the preheated oven and cook the potatoes for 50 minutes.
While the potatoes are cooking, make the crust for the salmon. Add to a food processor the walnuts, kalamata olives, dijon mustard, lemon juice, lemon zest, garlic cloves, dried oregano, and salt. Process a few times until you get a chunky crust. Be careful not to overprocess, or you will end up with a paste.
Wash the salmon in cold water, feeling for bones as you rinse it. Dry the salmon off and sprinkle the tops with a small pinch of salt and pepper.
After the potatoes have cooked for 50 minutes, take the baking dish out of the oven. Toss the potatoes with tongs to mix them up a bit before placing each salmon filet over the top of the potatoes, skin side down. Spoon the walnut and olive mixture over the salmon filets and smooth it out evenly.
Place the baking dish back into the oven and continue to bake the potatoes and salmon until the salmon is cooked to 145 degrees F, which is anywhere from 12-20 minutes, depending on the thickness of the salmon. (I usually do 18 minutes, just to be safe). While the salmon is cooking, you can prepare any other vegetable side that you would like to have (I did broccoli rabe in a skillet on the stovetop with a little olive oil, salt, and pepper).
When the salmon is cooked through, take the baking dish out of the oven. Transfer the salmon to a plate, and using a slotted spoon transfer the potatoes to the plate. You can spoon the incredibly flavorful broth over the potatoes, or freeze it to use another time as the base for a soup. Serve immediately with your veggie side of choice, and enjoy!