Preheat your oven to 400 degrees Fahrenheit and line a baking sheet with parchment paper.
Toss the broccoli florets with one tablespoon of olive oil, salt, pepper, and half of the garlic powder.
Spread the broccoli on the baking sheet and roast for 15-20 minutes until the edges are slightly charred.
Season the chicken breast with the remaining garlic powder, salt, pepper, and a squeeze of fresh lemon juice.
Heat a grill pan or outdoor grill over medium-high heat and lightly grease with a small amount of oil.
Grill the chicken for 6-7 minutes per side or until the internal temperature reaches 165 degrees Fahrenheit.
While the chicken rests, warm the pre-cooked brown rice in a small saucepan or microwave.
Slice the grilled chicken into strips and the avocado into thin wedges.
Assemble the bowl by placing the brown rice at the bottom, topped with the roasted broccoli, grilled chicken, and avocado.
Drizzle the remaining tablespoon of olive oil over the top and serve immediately.