Preheat your oven to 425°F (220°C).
Season Brussels sprouts with a drizzle of olive oil, salt, pepper, and garlic powder. Toss to coat evenly.
Spread the Brussels sprouts on a baking sheet and roast for 20-25 minutes, stirring halfway through, until crispy and tender.
Meanwhile, bring a pot of water to a boil and add the diced sweet potato. Boil until tender, about 10-15 minutes.
Drain the sweet potato and mash it until smooth with a pinch of salt, adjusting seasoning as desired.
For the chicken, either use precooked shredded chicken or poach the chicken breast in lightly salted water until fully cooked (about 12-15 minutes) and then shred it with two forks.
Plate the dish by layering the sweet potato mash, topping it with the shredded chicken, and finishing with the crispy roasted Brussels sprouts.
Serve warm and enjoy your balanced, protein-packed meal.