Creating Rainbow Thai Chicken Lettuce Wraps is easy if you follow these steps:

1. Heat the Oil: In a large skillet, heat the vegetable oil over medium heat.
2. Sauté Onion and Garlic: Add chopped onion and minced garlic, sautéing until they are translucent, about 2-3 minutes.
3. Cook Chicken: Increase the heat to medium-high and add the ground chicken. Cook until browned and fully cooked, breaking it apart with a spoon.
4. Add Vegetables: Stir in the diced bell peppers, grated carrots, and green onions. Cook for an additional 3-4 minutes until the vegetables soften.
5. Mix the Sauce: In a small bowl, combine soy sauce, sweet chili sauce, fish sauce (if using), lime juice, and grated ginger. Stir well.
6. Combine: Pour the sauce mixture over the chicken and vegetables. Stir to combine and let it cook for another 1-2 minutes.
7. Add Cilantro: Remove from heat and mix in the chopped cilantro for added freshness.
8. Prepare Lettuce: Carefully separate the leaves of the lettuce, rinsing and drying them thoroughly.
9. Assemble Wraps: Place a generous spoonful of the chicken mixture into the center of a lettuce leaf.
10. Roll and Serve: Wrap the lettuce around the filling and enjoy immediately, either as is or accompanied by additional sauces.

These straightforward steps will lead you to deliciously satisfying Rainbow Thai Chicken Lettuce Wraps that will impress everyone!