Preheat your oven to 425°F for roasting the broccoli.
Season the salmon fillet with salt, pepper, and half of the dried thyme. Set aside.
In a small pot, heat olive oil over medium heat. Sauté the chopped onion, red bell pepper, and minced garlic until softened, about 3-4 minutes.
Add the tomato sauce and remaining thyme to the pot, and let it simmer for another 3 minutes to meld the flavors into a light brown stew sauce.
Place the salmon in a baking dish and pour the prepared stew sauce over it, ensuring the fillet is well coated.
Roast the salmon in the oven at 425°F for about 10-12 minutes, or until the salmon flakes easily with a fork.
Meanwhile, toss the broccoli with a little olive oil, salt, and pepper, and spread it on a separate baking tray.
Roast the broccoli in the oven alongside the salmon or in a separate rack for 10-12 minutes until the edges become crispy.
Once cooked, serve the flaky brown stew salmon with the crispy roasted broccoli on the side.