Defrost and clean the chicken breast. Transfer to a clean container and set aside.
Make the Marinade:
In a mixing bowl, combine the yogurt, garlic, turmeric powder, paprika, nigella seeds, black pepper, and salt.
Whisk until well incorporated to form a marinade.
Marinate the Chicken:
Place the chicken breast in the marinade, ensuring it is evenly coated.
Cover and refrigerate for at least 2 hours, or overnight for best results.
Cook the Chicken:
For sous-vide: Preheat the sous-vide water bath to 145°F (63°C). Place the marinated chicken in vacuum-sealed bags and cook for 1.5 hours.
For grilling or baking: Preheat the grill or oven to medium-high heat. Cook the chicken until the internal temperature reaches 165°F (74°C), about 20-25 minutes, turning halfway through.
Prepare the Baby Gem Salad:
Halve or quarter the baby gem lettuce heads and arrange on a serving platter.
Add the sliced avocado, halved cherry tomatoes, corn kernels, and thinly sliced red onion.
In a small bowl, mix the minced garlic with olive oil and lemon juice. Drizzle over the salad.
Season with salt and pepper to taste.
Serve:
Slice the cooked chicken breast and arrange on top of the baby gem salad.