Preheat your grill or grill pan over medium-high heat.
In a small bowl, whisk together the juice of 1/2 a lemon, 2 teaspoons of olive oil, and the minced garlic.
Pat the chicken breast dry and brush it with the lemon-garlic mixture. Let it marinate for 10-15 minutes.
Grill the chicken for about 5-6 minutes per side, or until the internal temperature reaches 165°F.
While the chicken is grilling, preheat your oven to 425°F for roasting the broccoli.
Toss the chopped broccoli with 1 teaspoon of olive oil, salt, and pepper, then spread it on a baking sheet.
Roast the broccoli in the preheated oven for about 15 minutes or until it is tender and has slight charred edges.
Meanwhile, lightly sauté the cauliflower rice in a non-stick pan over medium heat for 3-4 minutes, seasoning with salt and pepper as desired.
Plate the grilled chicken alongside the roasted broccoli and cauliflower rice. Drizzle any remaining pan juices over the chicken for added flavor.
Serve immediately and enjoy your balanced, low-carb lunch.