Preheat your grill or grill pan over medium-high heat.
Season the chicken breast with salt, pepper, and your choice of herbs.
Grill the chicken for about 6-7 minutes per side, or until fully cooked and the internal temperature reaches 165°F.
Meanwhile, preheat your oven to 400°F for the broccoli.
Toss the chopped broccoli with 1 teaspoon of olive oil, salt, and pepper, then spread evenly on a baking sheet.
Roast the broccoli in the oven for 12-15 minutes until tender and slightly crispy on the edges.
For the sweet potato mash, peel and chop the sweet potato into small cubes.
Boil the sweet potato cubes in water until soft, about 10-12 minutes, then drain.
Mash the sweet potato lightly using a fork, seasoning with a pinch of salt and pepper to taste.
Plate the grilled chicken with a side of roasted broccoli and a serving of sweet potato mash, and enjoy your balanced lunch.