Preheat your oven to 425F. Line a baking sheet with a silicone baking mat, parchment paper or aluminum foil sprayed with cooking spray.
Toss potatoes with fat, garlic salt, black pepper, rosemary, and onion powder.
Place potatoes evenly spread on the center of the baking sheet and bake for 10 minutes.
Remove the baking sheet from the oven. Then, for the broccoli I use a misto or some kind of cooking spray like avocado oil spray. Place the broccoli on the baking sheet, coat it with cooking spray then sprinkle on the garlic salt.
On the other side of the potatoes place salmon fillets face up and coat with everything but the bagel seasoning.
Place the whole sheet back in the oven and bake for an additional 20 minutes until salmon is cooked/flaky and veggies are tender.
Note* I like my salmon on the dryer side, you may want to make foil packets for yours to keep it more tender OR take it out of the oven sooner.