Prepare salmon by placing the salmon fillets in parchment paper pouches and bake for 20 minutes in a 400F oven.
Meanwhile, combine brown rice and quinoa with 2 1/2 cups water in a medium saucepan and bring to a boil. Reduce to a simmer, cover and cook for about 45 minutes or until the grains are tender and most of the liquid has absorbed. Let stand for 5 minutes, then fluff with a fork.
In a skillet over medium heat, add olive oil and cook garlic until fragrant. Add spinach leaves and saute until wilted.
To make the Lemon Dijon Dressing, whisk all ingredients in a bowl until well combined. Season with salt and pepper to taste
To assemble the grain bowls, divide cooked rice mixture into two bowls and arrange salmon, sauteed spinach, broccoli florets, sprouts, and radishes on top. Drizzle with dressing and serve warm.