Prepare the ingredients as instructed above.
Cook the rice: Follow the package instructions. Once tender, fluff with a fork. Season with salt and pepper.
Prepare the shawarma marinade: In a bowl, mix garlic powder, coriander, cumin, cardamom, paprika, salt, black pepper, lemon juice, and olive oil. Add the chicken and toss to coat. Set aside.
Make the garlic sauce: Blend garlic, lemon, olive oil, salt, black pepper. Drizzle in extra oil as needed while blended until smooth and frothy. (Optional: For a milder flavor, boil the garlic in water for 5 minutes before blending).
Cook the chicken: Heat a grill over medium heat. Cook the chicken on both sides until nicely marked and cooked through to an internal temperature of 165°F (74°C). Let rest for 5 minutes, then slice.
Make the mango lassi: In a blender, combine frozen mango, yogurt, milk, and honey. Blend until smooth. Sprinkle the top with ground cardamom.
Assemble the bowls: Portion the rice. Top with lettuce, cucumbers, diced tomato, red onion, chicken, pickles and feta. Drizzle with garlic sauce. Serve with mango lassi.