Trim the ends off of the brussels sprouts and cut them in half. Cut the carrots into 1u0022 pieces and add them to a large sheet pan with the sliced brussels sprouts and red onion. Toss together with olive oil and season with salt, pepper and garlic powder.
Bake the veggies for 25-30 minutes.
While the veggies bake, prepare the maple mustard sauce by combining the sauce ingredients together in a bowl and whisking them together until smooth.
Remove the veggie sheet pan from the oven after 25-30 minutes and give the veggies a toss. Add the salmon fillets to the center of the pan.
Combine the spice mix for the salmon in a small bowl and generously season each fish fillet. Brush about 1 tsp of the maple dijon sauce over the top of each salmon then drizzle with olive oil.
Place the sheet pan back into the oven to finish cooking for about 15 minutes, until the salmon is cooked to your liking.
Pour the rest of the maple dijon sauce over the fish and veggies before serving.