Preheat your oven to 400°F. Line a baking sheet with parchment paper.
Rinse the quinoa under cold water. In a small pot, combine the quinoa with water (use a 1:2 ratio of quinoa to water), bring to a boil, then reduce heat and simmer until the quinoa is tender and water is absorbed, about 15 minutes.
While the quinoa cooks, place the salmon fillet on the baking sheet. Drizzle 1 tsp of olive oil, season with salt and pepper, and squeeze half the lemon juice over the top.
In a mixing bowl, toss the chopped broccoli with 1 tsp olive oil, minced garlic (from 2 cloves), the remaining lemon juice, salt, and pepper.
Arrange the broccoli around the salmon on the same baking sheet, ensuring even spacing for proper roasting.
Roast in the preheated oven for 12-15 minutes, or until the salmon flakes easily and the broccoli is tender with slightly crispy edges.
Once cooked, plate a serving by placing a scoop of quinoa on the plate, topping it with the roasted salmon and broccoli. Garnish with slices of avocado.
Serve immediately and enjoy your balanced, nutrient-packed dinner.