Season the chicken: Season chicken with salt, pepper, and garlic powder.
Sear the chicken: Heat sesame oil and olive oil in a skillet over medium-high heat. Cook chicken 4–5 minutes per side until golden and cooked through. Remove and slice.
Build the broth: In a large pot, sauté garlic and ginger for 30 seconds. Add chicken broth, soy sauce, tahini, and rice vinegar. Simmer 8–10 minutes.
Make it creamy: Stir in heavy cream (or coconut milk) and gently simmer 2 minutes.
Cook noodles & vegetables: Add ramen noodles, bok choy, and shredded carrots to the broth. Cook 2–3 minutes until noodles are tender and bok choy is just wilted. Stir in corn if using.
Assemble & serve: Divide ramen into bowls. Ladle noodles and creamy broth into each bowl. Top with sliced sesame chicken, bok choy, shredded carrots, cucumber slices, green onions, and sesame seeds. Serve hot.