Heat broth to a simmer in a small pot. Stir in quinoa, reduce heat to a steady simmer, cover and cook for about 18 minutes (I find cooking quinoa in broth takes a few minutes longer than just water). Remove from heat and allow to rest for 5 minutes.
In a small bowl whisk together 1 tbsp olive oil, lemon juice, mustard, half of the thyme, salt and pepper. Set aside.
In a medium skillet, heat 1 tbsp of olive oil. Once hot, add mushrooms and cook on medium highfor 3-4 minutes until starting to turn golden. Stir and continue to cook for about 2 minutes. Add garlic, shallots and half of the thyme. Cook, stirring often until garlic and shallots have softened, another 2-3 minutes.
Fluff quinoa with a fork and add to mushrooms, stirring to combine. Season lightly with salt and pepper.
Add arugula and sauté for 1-2 minutes until starting to soften and wilt. Remove from heat and stir in dressing. Divide into 2 bowls and top with grated parmesan cheese and toasted nuts.
I used pine nuts here, but cashews are also wonderful. To quickly toast nuts, heat 1 tsp of olive oil in a small pan over medium heat. Add nuts and toss or stir occasionally until golden.