Preheat oven to 400°
Trim the stalks of the fennel. Remove the outer layer of the fennel and thinly slice the bulb crosswise.
On a large baking dish lined with parchment paper, add the sliced fennel, the spring onions, and radishes. Drizzle about 1 tbsp of olive oil and salt and pepper to taste. Toss and arrange the veggies to the outer parts of the baking dish leaving some of JUST the fennel in the center.
Lay the salmon on top of some of the fennel, and spread the other tbsp of olive oil. Next, spread the ground mustard.
Add the onion powder, dried fennel, salt, pepper, and coriander, and press it into the salmon.
Bake the salmon and veggies for about 12-15 minutes until the salmon is cooked through and the veggies are tender.
Serve and enjoy!