Season the chicken with olive oil, salt, pepper, and spices. Grill over medium-high heat for 5–6 minutes per side until cooked through (165°F), then let rest and slice.
Toss broccoli with olive oil, lemon juice, and salt, then roast at 400°F for 15–20 minutes until crisp-tender and slightly golden.
Cook the grains as directed on the package, fluff with a fork, and keep warm.
Melt butter in a saucepan over medium heat, sauté garlic for 1 minute, then stir in heavy cream. Season with salt and pepper and simmer 3–4 minutes until slightly thickened.
Layer grains in serving bowls, add grilled chicken and roasted broccoli, drizzle with garlic sauce, and finish with parsley or chives.