Preheat your oven to 425°F. Line a baking sheet with parchment paper and lightly coat with cooking spray.
Toss the chopped cauliflower with a pinch of salt, pepper, and garlic powder. Spread evenly on the baking sheet.
Roast the cauliflower in the oven for about 20-25 minutes, or until tender and slightly caramelized, turning halfway through.
While the cauliflower roasts, season the salmon fillet with salt, pepper, and a drizzle of lemon juice.
Heat a non-stick skillet over medium-high heat. Sear the salmon skin-side down (if applicable) for about 3-4 minutes, then flip and cook for another 3-4 minutes until the salmon is opaque and flakes easily.
Prepare the quinoa if not already cooked. Heat it briefly if desired.
In a small bowl, mix the nonfat Greek yogurt with a little lemon juice, garlic powder, salt, and pepper to create a light, tangy sauce.
To plate, arrange a bed of quinoa, top with the seared salmon, and add the roasted cauliflower. Drizzle the yogurt sauce lightly over the top.
Serve warm and enjoy your balanced, nutrient-packed dinner.