Preheat your grill or grill pan over medium-high heat.
Season the chicken breast on both sides with salt, pepper, and garlic powder.
Lightly brush the chicken with a small amount of olive oil to prevent sticking.
Grill the chicken breast for approximately 6-7 minutes per side, or until the internal temperature reaches 165°F.
While the chicken is grilling, preheat the oven to 425°F for the broccoli.
Toss the broccoli florets with olive oil, a pinch of 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.
Once the chicken is done, transfer it to a plate and let it rest for a few minutes.
Drizzle the chicken with fresh lemon juice to enhance its flavor.
Plate the grilled chicken alongside the roasted broccoli and serve immediately.