Place the fresh herbs, garlic clove, juice of one of the lemons and a tablespoon of olive oil into a food processor and mix to a paste. Stir through the quinoa and set aside ready for serving.
Coat the pounded chicken breasts with a tablespoon of the olive oil and a little salt and pepper. Heat a griddle over a medium high heat and then griddle the chicken breasts for 2-3 minutes on each side until cooked through and browned.
While the chicken is cooking heat the other tablespoon of oil in a frying pan or skillet and add the Brussels sprouts and shallot and saute for 5 minutes. Add the balsamic vinegar and cook until the sprouts are cooked with a little bit of a bite left. Add the spinach and let it wilt before removing from the heat.
Split the quinoa between two bowls. Slice the chicken breasts and place on top of the quinoa along with a helping of the sprouts and spinach mixture. Serve with lemon wedges to squeeze over the top.