Preheat the oven to 425°F.

Place chicken and broccoli into a bowl. Add the sweet chili sauce and half the olive oil and toss to coat.

Place sweet potatoes on a large baking sheet. Drizzle over the remaining olive oil, toss to evenly coat. Roast for 10 minutes.

Remove the baking sheet from the oven. Add the chicken and broccoli. Spread chicken and veggies out so they form an even layer. Return to the oven and roast for another 15 minutes, until the chicken is cooked and the veggies are golden brown on the edges.

Divide the roast chicken and vegetables evenly between two plates, squeeze over some lemon juice and serve.